Shock Waves最新文献_第7页

Swept shock/boundary-layer interaction control using micro-vortex generators 利用微型涡流发生器控制扫荡冲击/边界层相互作用

IF 1.7 4区工程技术

Shock Waves Pub Date : 2024-02-28 DOI: 10.1007/s00193-023-01155-0

A. Khan, M. Chidambaranathan, S. B. Verma, R. Kumar

{"title":"Swept shock/boundary-layer interaction control using micro-vortex generators","authors":"A. Khan, M. Chidambaranathan, S. B. Verma, R. Kumar","doi":"10.1007/s00193-023-01155-0","DOIUrl":"10.1007/s00193-023-01155-0","url":null,"abstract":"<div><p>Passive flow control devices, such as vortex generators (VGs), have shown to be successful in controlling flows associated with shock-wave/boundary-layer interactions. In the present work, we investigate the effectiveness of micro-VGs in controlling the interactions of the boundary layer with a swept shock wave generated by a semi-infinite fin placed in a Mach 2 freestream generated in a wind tunnel with a rectangular cross section. The strength of the interaction is varied by changing the angle of attack of the fin in the range <span>(alpha = 3^circ )</span>–<span>(15^circ )</span>. Arrays of micro-VGs are placed upstream of the interaction zone in two different configurations: (I) along a line perpendicular to the freestream and (II) along a line inclined to the freestream following the conical topology of the interaction zone. A parametric analysis is done for the rectangular, ramp, and Anderson-type micro-VGs for three different heights. Unsteady and time-averaged pressure measurements are done using arrays of ports spanned radially across the interaction zone. Surface flow patterns are obtained using the oil-flow visualisation technique. It is observed that VGs offer significantly better control effectiveness when placed inclined to the freestream along the interaction region. The rectangular VGs demonstrate a maximum shift (as much as <span>(8^circ )</span>) in the upstream influence line azimuthally towards the fin resulting in a decrease in the size of the separation region. Footprints obtained from the oil-flow experiments give important signatures of the vortices that are shed from the VGs and are responsible for the flowfield distortion in the interaction zone.\u0000</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"33 7-8","pages":"553 - 567"},"PeriodicalIF":1.7,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Extension of the normal shock wave relations for calorically imperfect gases 热量不完全气体正常冲击波关系的扩展

IF 1.7 4区工程技术

Shock Waves Pub Date : 2024-02-28 DOI: 10.1007/s00193-023-01153-2

C. H. B. Civrais, C. White, R. Steijl

{"title":"Extension of the normal shock wave relations for calorically imperfect gases","authors":"C. H. B. Civrais, C. White, R. Steijl","doi":"10.1007/s00193-023-01153-2","DOIUrl":"10.1007/s00193-023-01153-2","url":null,"abstract":"<div><p>An extension to the normal shock relations for a thermally perfect, calorically imperfect gas, modelling the vibrational excitation with an anharmonic oscillator model and including the influence of electronic modes, is derived and studied. Such additional considerations constitute an extension to the work achieved in the past, which modelled the caloric imperfections with a harmonic oscillator for vibrational energy and did not consider the effect of electronic energy. Additionally, the newly derived expressions provide physical insights into the limitations of experimentation for replicating flight conditions, which is demonstrated through providing solutions at different upstream temperatures. The results are compared with direct simulation Monte Carlo simulations for nitrogen and air, with the extent of the caloric imperfection of the gas showing excellent agreement. For low upstream temperatures, the extended relations are found to be in good agreement with the original normal shock wave expressions, but the results diverge for higher upstream temperatures that would be more representative of real flows. The results show that the new expressions depart from ideal gas theory for Mach numbers in excess of 4.9 at wind-tunnel conditions and for any Mach number above 3.0 at flight conditions. It is also shown that the traditional harmonic oscillator model and the anharmonic oscillator model begin to diverge at Mach number 3.0 for molecular oxygen gas and at Mach number 5.0 for an air mixture at flight conditions.\u0000</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"33 7-8","pages":"533 - 551"},"PeriodicalIF":1.7,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00193-023-01153-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic behaviour of YAG transparent ceramic under ramp wave and shock compression loading up to 20 GPa YAG 透明陶瓷在高达 20 GPa 的斜波和冲击压缩加载下的动态特性

IF 1.7 4区工程技术

Shock Waves Pub Date : 2024-02-23 DOI: 10.1007/s00193-023-01152-3

K. Bao, X. Zhang, G. Wang, J. Deng, T. Chong, D. Han, L. Bingqiang, M. Tan

{"title":"Dynamic behaviour of YAG transparent ceramic under ramp wave and shock compression loading up to 20 GPa","authors":"K. Bao, X. Zhang, G. Wang, J. Deng, T. Chong, D. Han, L. Bingqiang, M. Tan","doi":"10.1007/s00193-023-01152-3","DOIUrl":"10.1007/s00193-023-01152-3","url":null,"abstract":"<div><p>YAG transparent ceramic has great potential in the applications to transparent armour protection modules. To study the dynamic behaviour and obtain the parameters for the equation of state of YAG under the load of longitudinal stress ranging from 0 to 20 GPa, ramp wave and shock compression experiments were conducted based on the electromagnetic loading test platform. The Hugoniot data, isentropic data, dynamic strength, and elastic limit of YAG were obtained. The results showed that the relationship between the longitudinal wave speed and the particle velocity of YAG was linear when the longitudinal stress was lower than the elastic limit. The quasi-isentropic compression and shock Hugoniot compression curves were coincident when the stress in YAG was below 10 GPa; however, a separation of the two curves occurred when the stress in YAG ranged from 10 GPa to the elastic limit. Moreover, the effect of strain rate on the fracture stress of YAG under a moderate strain rate of 10<span>(^{textrm{5}})</span>–10<span>(^{textrm{6}})</span> <span>(hbox {s}^{mathrm {-1}})</span> was more evident than in other strain rate ranges. The amplitude of the precursor wave decayed with increasing sample thickness.</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"33 7-8","pages":"585 - 596"},"PeriodicalIF":1.7,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139956009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental demonstration on detonation initiation by laser ignition and shock focusing in elliptical cavity 椭圆腔内激光点火和冲击聚焦引爆实验演示

IF 1.7 4区工程技术

Shock Waves Pub Date : 2024-01-27 DOI: 10.1007/s00193-023-01151-4

T. Sato, K. Matsuoka, A. Kawasaki, N. Itouyama, H. Watanabe, J. Kasahara

{"title":"Experimental demonstration on detonation initiation by laser ignition and shock focusing in elliptical cavity","authors":"T. Sato, K. Matsuoka, A. Kawasaki, N. Itouyama, H. Watanabe, J. Kasahara","doi":"10.1007/s00193-023-01151-4","DOIUrl":"10.1007/s00193-023-01151-4","url":null,"abstract":"<div><p>As a method of initiating detonation in a short distance with a small amount of energy, the combination of laser ignition and shock focusing in an elliptical cavity was proposed and experimentally demonstrated with a <span>(hbox {C}_{2}hbox {H}_{4}{-}hbox {O}_{2})</span> mixture at 100 kPa and 297 K. In the experiment, an elliptical cavity and single rectangular cavities of different heights were used, and their flow-field patterns were visualized using high-speed schlieren imaging. Detonation initiation was achieved in the case of the elliptical cavity, and based on the Mach number change of the leading shock wave, two propagation phases were verified: the deceleration and acceleration phases. The deceleration phase was driven merely by the gasdynamic effect, wherein the initial shock wave (ISW) expanded spherically, and the acceleration phase began when the ISW shifted to planar propagation. In the acceleration phase, although gradual acceleration was observed in rectangular cavities, rapid acceleration occurred in the elliptical cavity. From the schlieren images, the second acceleration was caused not only by the concave reflected shock wave’s catching up with the ISW, but also by the fast-flames that were generated along the cavity corners and engulfed the ISW in the converging section of the elliptical cavity.</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"33 7-8","pages":"521 - 531"},"PeriodicalIF":1.7,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00193-023-01151-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139585470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermochemical study of the detonation properties of boron- and aluminum-containing compounds in air and water 含硼和含铝化合物在空气和水中爆轰特性的热化学研究

IF 2.2 4区工程技术

Shock Waves Pub Date : 2023-11-02 DOI: 10.1007/s00193-023-01150-5

K. A. Byrdin, S. M. Frolov, P. A. Storozhenko, S. L. Guseinov

{"title":"Thermochemical study of the detonation properties of boron- and aluminum-containing compounds in air and water","authors":"K. A. Byrdin, S. M. Frolov, P. A. Storozhenko, S. L. Guseinov","doi":"10.1007/s00193-023-01150-5","DOIUrl":"10.1007/s00193-023-01150-5","url":null,"abstract":"<div><p>Contrary to the conventional chemical propulsion systems based on the controlled relatively slow (subsonic) combustion of fuel in a combustor, the operation process in pulsed detonation engines (PDEs) and rotating detonation engines (RDEs) is based on the controlled fast (supersonic) combustion of fuel in pulsed and continuous detonation waves, respectively. One of the most important issues for such propulsion systems is the choice of fuel with proper reactivity and exothermicity required for a sustained and energy-efficient operation process. Presented in the paper are the results of thermodynamic calculations of the detonation parameters of boron- and aluminum-containing compounds (B, B<span>(_{{2}})</span>H<span>(_{{6}})</span>, B<span>(_{{5}})</span>H<span>(_{{9}})</span>, B<span>(_{{10}})</span>H<span>(_{{14}})</span>, Al, AlH<span>(_{{3}})</span>, Al(C<span>(_{{2}})</span>H<span>(_{{5}})_{{3}})</span>, and Al(CH<span>(_{{3}})_{{3}}))</span> in air and water. The results demonstrate the potential feasibility of using the considered compounds as fuels for both air- and water-breathing transportation vehicles powered with PDEs and RDEs. As a verification of the reliability of the calculated results, the detonation parameters of diborane, aluminum, and isopropyl nitrate in air were compared with experimental data available in the literature.</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"33 6","pages":"501 - 520"},"PeriodicalIF":2.2,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135934267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Structure of shock and detonation waves propagating in hybrid methane/hydrogen/air/coal dust mixtures 混合甲烷/氢/空气/煤尘混合物中传播的激波和爆震波结构

IF 2.2 4区工程技术

Shock Waves Pub Date : 2023-10-24 DOI: 10.1007/s00193-023-01146-1

A. V. Pinaev, P. A. Pinaev

{"title":"Structure of shock and detonation waves propagating in hybrid methane/hydrogen/air/coal dust mixtures","authors":"A. V. Pinaev, P. A. Pinaev","doi":"10.1007/s00193-023-01146-1","DOIUrl":"10.1007/s00193-023-01146-1","url":null,"abstract":"<div><p>A study of shock and detonation waves propagating in gaseous two-fuel <span>(hbox {CH}_{{4}}/hbox {H}_{{2}})</span>/air mixtures and heterogeneous three-fuel <span>(hbox {CH}_{{4}}/hbox {H}_{{2}})</span>/air/coal mixtures with the mean bulk density of the coal dust suspension equal to <span>(95{-}560,hbox {g/m}^{{3}})</span> and with a particle size of <span>(0{-}200,upmu hbox {m})</span> is performed. The experiments are conducted in a vertical shock tube with a length of 6.75 m and a diameter of 70 mm. The detonation parameters measured in the experiments are compared with the calculated equilibrium thermodynamic values. It is found that the detonation wave parameters are mainly affected by methane and hydrogen rather than by the coal dust suspension. Decaying shock waves are as dangerous as detonation waves because blast wave reflections can initiate detonation. An increase in the hydrogen fraction in the mixture decreases the energy of initiation of <span>(hbox {CH}_{{4}}/hbox {H}_{{2}})</span>/air and <span>(hbox {CH}_{{4}}/hbox {H}_{{2}})</span>/air/coal mixtures, resulting in a greater hazard for the generation of shock and detonation waves in these mixtures.</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"33 6","pages":"473 - 482"},"PeriodicalIF":2.2,"publicationDate":"2023-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135267557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A comparison of explosively driven shock wave radius versus time scaling approaches 爆炸驱动冲击波半径与时间标度方法的比较

IF 2.2 4区工程技术

Shock Waves Pub Date : 2023-10-21 DOI: 10.1007/s00193-023-01149-y

M. J. Hargather, K. O. Winter, J. Kimberley, T. Wei

引用次数: 0

Combustion models for shock-induced cloud ignition of aluminium particles using smoothed particle hydrodynamics 基于光滑颗粒流体力学的铝颗粒激波云点火燃烧模型

IF 2.2 4区工程技术

Shock Waves Pub Date : 2023-10-21 DOI: 10.1007/s00193-023-01148-z

M. Omang, K. O. Hauge, J. K. Trulsen

{"title":"Combustion models for shock-induced cloud ignition of aluminium particles using smoothed particle hydrodynamics","authors":"M. Omang, K. O. Hauge, J. K. Trulsen","doi":"10.1007/s00193-023-01148-z","DOIUrl":"10.1007/s00193-023-01148-z","url":null,"abstract":"<div><p>The present work is a numerical follow-up on our published experimental paper on shock ignition of aluminium particle clouds in the low-temperature regime. The in-house multi-phase regularized smoothed particle hydrodynamics (MP-RSPH) code is used to perform numerical simulations with an increasing degree of complexity, looking at single-phase, inert, and reactive particles in separate simulations. The first part of the paper gives a short description of the additional physics added to the code. Based on the experimental results, the numerical code is then used to estimate the particle temperature at the time of ignition. Results from simulations with three different numerical descriptions, the diffusive, kinetic, and total burn rates, are then compared to the experimental results. The two diffusive burn rate simulations (K &H and O &H) show the best fit to the experimental results. The burn rate formula based on our experimental data (O &H) is preferred, since it has the gas temperature dependency included and does not require additional parameter adjustments. The results from the numerical simulations support the theory that the observed aluminium particle cloud burning process is diffusive, as indicated in the experimental paper.</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"33 6","pages":"461 - 472"},"PeriodicalIF":2.2,"publicationDate":"2023-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00193-023-01148-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135510961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of thermal pretreatment and equivalence ratio on DME/({hbox {O}}_2)/({hbox {O}}_3) detonations 热预处理和当量比对二甲醚/ ({hbox {O}}_2) / ({hbox {O}}_3)爆轰的影响

IF 2.2 4区工程技术

Shock Waves Pub Date : 2023-10-10 DOI: 10.1007/s00193-023-01147-0

M. C. Brown, E. L. Belmont

{"title":"Effects of thermal pretreatment and equivalence ratio on DME/({hbox {O}}_2)/({hbox {O}}_3) detonations","authors":"M. C. Brown, E. L. Belmont","doi":"10.1007/s00193-023-01147-0","DOIUrl":"10.1007/s00193-023-01147-0","url":null,"abstract":"<div><p>The inerting of a detonable mixture through thermal pretreatment or parasitic combustion is critical to understand for advanced detonation-based combustor design and safety. This work addresses the inerting effects of low temperature chemistry (LTC) on detonations. LTC was induced in both ozoneless DME/O<span>(_{textrm{2}})</span> and 1.0 mol% O<span>(_{{3}})</span>-enhanced DME/O<span>(_{2})</span> mixtures over a range of detonation tube temperatures (<span>(T_{textrm{o}})</span>) from 423 to 648 K for reactant mixture equivalence ratios (<span>(phi )</span>) of 0.6–1.8. Upon filling the detonation tube, reactant gas temperatures increased by over 100 K in some cases but never exceeded a maximum gas temperature of 700 K, suggesting a limiting behavior such as the RO<span>(_{2})</span> ceiling temperature. Zero-dimensional constant-volume simulations were conducted to identify chemical composition changes and heat releasing reactions with LTC pretreatment, and ZND simulations were conducted to show the evolution of thermicity with LTC pretreatment. Prolonged pretreatment at <span>(T_{textrm{o}})</span> greater than 573 K prior to spark ignition of detonation was observed to inert DME/O<span>(_{2})</span> mixtures and inhibit detonation transition for all tested <span>(phi )</span>. Additionally, detonation cell sizes were measured, and increased DDT distances and detonation cellular instability at near-limit conditions due to LTC pretreatments were observed using soot foils. Numerical cell sizes were estimated using a correlation model based on center-of-exothermic-length from ZND thermicity simulations, and results showed good agreement with experimental cell sizes. Stability parameter and DDT distance analyses based on correlation models supported the observed reduction in mixture detonability and increase in DDT distances with LTC pretreatment progression.\u0000</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"33 6","pages":"483 - 500"},"PeriodicalIF":2.2,"publicationDate":"2023-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136295663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An analysis of flow structures of underwater supersonic gas jets: a numerical study 水下超声速气体射流流动结构分析:数值研究

IF 2.2 4区工程技术

Shock Waves Pub Date : 2023-09-08 DOI: 10.1007/s00193-023-01141-6

A. Jana, L. Hoskoti, M. M. Sucheendran

{"title":"An analysis of flow structures of underwater supersonic gas jets: a numerical study","authors":"A. Jana, L. Hoskoti, M. M. Sucheendran","doi":"10.1007/s00193-023-01141-6","DOIUrl":"10.1007/s00193-023-01141-6","url":null,"abstract":"<div><p>The present work is focused on the numerical analysis of the flow structures of high-speed underwater air jets. In an earlier work (Jana et al., J. Fluids Eng. 144(11):111208, 2022), the authors presented an analysis of the unsteady behavior of different flow variables of the jets. The present work is further extended to analyze the temporal evolution of the flow structures of different jet regions. The numerical simulations are conducted with the unsteady Reynolds-averaged Navier–Stokes equations with a homogeneous mixture model. The previous work rendered the effect of pressure ratio (the ratio of nozzle exit pressure to back pressure) on the behavior of the jet flow. In the present analysis, jet exit Mach number is also considered as another operating parameter. The results for three pressure ratios, 0.8, 1, and 1.2, and two exit Mach numbers, 2 and 3, are presented. Temporal behavior of the three major regions, namely, the core, shear layer, and mixing layer of the jet due to its interaction with surrounding water, is discussed. The flow physics of shock and expansion waves in the core region is analyzed, and the effects of the underwater ambience on the structures of shock waves are also explained. Various phenomena, such as necking, back-attack, and expansion, are also visualized and explained from the simulated flow variables. Given the limitations of experimental flow visualizations, these analyses aid to understand the major flow behavior of supersonic underwater jets.\u0000</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"33 5","pages":"429 - 447"},"PeriodicalIF":2.2,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00193-023-01141-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6713797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0