Shock Waves最新文献_第8页

Flow acceleration in an RDRE with gradual chamber constriction 腔室逐渐收缩时rdrre中的流动加速度

IF 2.2 4区工程技术

Shock Waves Pub Date : 2023-02-06 DOI: 10.1007/s00193-022-01117-y

M. Ross, J. Burr, Y. Desai, A. Batista, C. Lietz

{"title":"Flow acceleration in an RDRE with gradual chamber constriction","authors":"M. Ross, J. Burr, Y. Desai, A. Batista, C. Lietz","doi":"10.1007/s00193-022-01117-y","DOIUrl":"10.1007/s00193-022-01117-y","url":null,"abstract":"<div><p>Rotating detonation propulsion technologies have the potential to create highly efficient engines in a small form factor. However, the detonation dynamics and complex flowfields inside the combustion chamber are greatly dependent on geometry; in particular, the downstream nozzle design affects dynamics inside the combustion chamber. In this work, three-dimensional large eddy simulations of a gaseous methane–oxygen rotating detonation rocket engine are presented for two geometries. The geometries match experimental tests previously conducted at the Air Force Research Laboratory and are chosen to compare engine operation with and without a converging–diverging nozzle. It is shown that flow in the unconstricted chamber exceeds Mach 1 behind the generated oblique shock structure, but that the addition of a 4.4<span>(^circ )</span> converging section results in supersonic flow existing only in the diverging section of the nozzle. The formation enthalpy of the flow is calculated inside the chamber and demonstrates that the difference in pressures and detonation structures associated with the chamber area constriction do not result in a significant change in energy released through combustion.</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"33 3","pages":"253 - 265"},"PeriodicalIF":2.2,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00193-022-01117-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4249604","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: 1

Effects of ozone addition and LTC progression on detonation of O(_{3})-enhanced DME–O(_{2}) 臭氧添加和LTC进程对O (_{3}) -增强DME-O爆轰的影响(_{2})

IF 2.2 4区工程技术

Shock Waves Pub Date : 2023-01-13 DOI: 10.1007/s00193-022-01113-2

M. C. Brown, E. L. Belmont

{"title":"Effects of ozone addition and LTC progression on detonation of O(_{3})-enhanced DME–O(_{2})","authors":"M. C. Brown, E. L. Belmont","doi":"10.1007/s00193-022-01113-2","DOIUrl":"10.1007/s00193-022-01113-2","url":null,"abstract":"<div><p>The effects of ozone addition and low-temperature chemistry (LTC) progression on DME/O<span>(_{2})</span> detonations are evaluated with experimental detonation velocity and cell size measurements and one-dimensional ZND simulations. For <span>( phi = 1.2)</span> and <span>(P_{textrm{o}}= 22.7)</span> kPa, detonations are experimentally investigated over a range of ozone enhancement levels (0.0–1.6-mol%), initial reactant temperatures (293 K and 468 K), and LTC progression times (250–6000 ms). A 33-K gas temperature rise from LTC heat release is observed for mixtures with 1.0-mol% ozone enhancement and initial temperature of 468 K, suggesting a limited extent of LTC progression in this study. Experiments showed minimal detonation velocity dependence on ozone enhancement level or LTC progression despite the increased radical pool. Average cell size is found to decrease 15–30% with 1.6-mol% ozone addition, indicating a greater reactant mixture sensitivity to detonation. To estimate the cell size, a center-of-exothermic-length induction length is defined and used with an empirical correlation to calculate a singular cell size when multiple thermicity peaks are present in ZND modeling. This approach shows good agreement with experimental findings. Cell size dependence on LTC progression is found to have a statistically insignificant variance for LTC progression times at the temperatures used in this study.\u0000</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"33 1","pages":"21 - 37"},"PeriodicalIF":2.2,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4535663","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: 1

Atomville: Architects, Planners, and How to Survive the Bomb. Atomville:建筑师，规划师，以及如何在炸弹中生存

IF 0.7 4区工程技术

Shock Waves Pub Date : 2023-01-01 DOI: 10.1353/tech.2023.a903974

Arthur Molella, Robert Kargon

引用次数: 0

Study on the factors influencing the interaction and coalescence of shock waves from multiple explosion sources in free field 自由场多爆炸源激波相互作用与聚并的影响因素研究

IF 2.2 4区工程技术

Shock Waves Pub Date : 2022-12-28 DOI: 10.1007/s00193-022-01111-4

S. Y. Wang, J. L. Qiu, Y. W. Wang, J. W. Jiang

{"title":"Study on the factors influencing the interaction and coalescence of shock waves from multiple explosion sources in free field","authors":"S. Y. Wang, J. L. Qiu, Y. W. Wang, J. W. Jiang","doi":"10.1007/s00193-022-01111-4","DOIUrl":"10.1007/s00193-022-01111-4","url":null,"abstract":"<div><p>The interaction and coalescence of shock waves originating from multiple explosion sources were studied using numerical simulations and theoretical analysis. The effects of the mass distribution, layout, and quantity of explosion sources were considered, and an engineering calculation model for shock wave parameters at the focus center was established. The results show that the peak overpressure at the focus center is significantly changed only when the mass ratio of the two explosion sources increases beyond two. Overall, the peak overpressure at the focus center decreases with the increase in mass ratio. The focus effect of multiple explosion sources is the greatest when the sources are uniformly distributed on a circle. When the number of explosion sources is less than four, the peak overpressure and specific impulse at the focus center increase with the increase of the number of explosion sources. Increasing the number of explosion sources from one to four results in an increase in the peak overpressure by a factor of 0.73–5.23 and an increase in the specific impulse gain by a factor of 1.59–4.71. The results from simulations and experiments verify the validity of the model used to characterize multiple explosion sources.\u0000</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"33 1","pages":"51 - 60"},"PeriodicalIF":2.2,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5078899","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

Self-sustained oscillations of lift and drag forces, heat fluxes, and flowfield parameters over supersonic bodies under asymmetrical energy deposition 在不对称能量沉积下超音速物体上升力和阻力、热通量和流场参数的自持续振荡

IF 2.2 4区工程技术

Shock Waves Pub Date : 2022-12-22 DOI: 10.1007/s00193-022-01114-1

O. A. Azarova, D. D. Knight, O. V. Kravchenko

引用次数: 1

Tall buildings damage in Beirut ammonium nitrate explosion 贝鲁特硝酸铵爆炸高层建筑受损

IF 2.2 4区工程技术

Shock Waves Pub Date : 2022-12-07 DOI: 10.1007/s00193-022-01112-3

M. L. Ivanov, W. -K. Chow

引用次数: 1

The effect of increasing rarefaction on the formation of Edney shock interaction patterns: type-I to type-VI 增加稀薄度对Edney激波相互作用模式形成的影响:i型到vi型

IF 2.2 4区工程技术

Shock Waves Pub Date : 2022-12-06 DOI: 10.1007/s00193-022-01109-y

M. B. Agir, C. White, K. Kontis

{"title":"The effect of increasing rarefaction on the formation of Edney shock interaction patterns: type-I to type-VI","authors":"M. B. Agir, C. White, K. Kontis","doi":"10.1007/s00193-022-01109-y","DOIUrl":"10.1007/s00193-022-01109-y","url":null,"abstract":"<p>A shock–shock interaction problem can arise in high-speed vehicles where an oblique shock from one part of the body impinges on a bow shock from a different part of the body. The nature of the interaction can change as the vehicle increases in altitude to a more rarefied environment. In this work, the outcomes of a numerical study investigating the formation of Edney shock patterns from type-I to type-VI as a result of shock–shock interactions at different rarefaction levels are presented. The computations are conducted with a direct simulation Monte Carlo solver for a free-stream flow at a Mach number of 10. In shock–shock interaction problems, both geometrical and rarefaction parameters determine what type of Edney pattern is formed. The region on the shock impinged surface that experiences enhanced thermo-mechanical loads increases when the free-stream flow becomes more rarefied, but the peak values decrease. It is known that these shock interactions can have unsteady behavior in the continuum regime; the current work shows that although increasing rarefaction tends to move the flow toward steady behavior, under some conditions the flow remains unsteady.</p>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"32 8","pages":"733 - 751"},"PeriodicalIF":2.2,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00193-022-01109-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4245694","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

Improved shock-reloading technique for dynamic yield strength measurements 用于动态屈服强度测量的改进冲击再加载技术

IF 2.2 4区工程技术

Shock Waves Pub Date : 2022-12-05 DOI: 10.1007/s00193-022-01110-5

X. Li, Z. Duan, X. Nan, Y. Gan, Y. Yu, J. Hu

引用次数: 1

Development of a steady detonation reactor with state-to-state thermochemical modeling 用状态-状态热化学模型建立稳定爆震反应堆

IF 2.2 4区工程技术

Shock Waves Pub Date : 2022-12-05 DOI: 10.1007/s00193-022-01105-2

J. Vargas, R. Mével, M. Lino da Silva, D. A. Lacoste

{"title":"Development of a steady detonation reactor with state-to-state thermochemical modeling","authors":"J. Vargas, R. Mével, M. Lino da Silva, D. A. Lacoste","doi":"10.1007/s00193-022-01105-2","DOIUrl":"10.1007/s00193-022-01105-2","url":null,"abstract":"<div><p>In recent years, several studies have been dedicated to modeling of detonations including assumptions of thermal non-equilibrium. Modeling using two-temperature models has shown that non-equilibrium affects detonation dynamics. However, the deployment of state-to-state models, one of the foremost non-equilibrium modeling tools, in detonation modeling remains under-explored. In this work, we detail the implementation of a STS model of <span>({hbox {N}_{2}})</span> and <span>({hbox {O}_{2}})</span> in a Zel’dovich–von Neumann–Döring reactor for a mixture of <span>({hbox {H}_{2}})</span>–air. Certain modifications to the usual theory and models must be performed before the deployment of aforementioned model, namely in the thermodynamics formulation. Additionally, since most codes are not compatible with STS models, a validation of an in-house code is carried out against CHEMKIN. Results indicate that the multi-temperature approach adopted in earlier works is likely not appropriate to model the internal distribution function of <span>({hbox {O}_{2}})</span> and therefore should be used with caution. A comparison of an estimated cell width with experimental values confirms the potential of the STS framework for a more accurate detonation modeling.\u0000</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"32 8","pages":"679 - 689"},"PeriodicalIF":2.2,"publicationDate":"2022-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4200993","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: 2

Shock ignition of aluminium particle clouds in the low-temperature regime 低温条件下铝粒子云的激波点火

IF 2.2 4区工程技术

Shock Waves Pub Date : 2022-11-24 DOI: 10.1007/s00193-022-01108-z

M. Omang, K. O. Hauge

{"title":"Shock ignition of aluminium particle clouds in the low-temperature regime","authors":"M. Omang, K. O. Hauge","doi":"10.1007/s00193-022-01108-z","DOIUrl":"10.1007/s00193-022-01108-z","url":null,"abstract":"<div><p>In this paper, we present results from spontaneous ignition of aluminium particle clouds in a series of shock tube experiments. For all experiments, the shock propagates along a narrow pile of 40-<span>(upmu )</span>m aluminium particles. The study includes shock Mach numbers in the range from 1.51 to 2.38. The results are visualised using photographic techniques and pressure gauges. The combination of two Phantom high-speed video cameras and a beamsplitter allows a compact schlieren setup mounted together with a dark-film high-speed camera. While the schlieren technique allows the shock features to be identified, the dark-film camera is used to capture the ignition and burning of the aluminium particle clouds. Based on extensive image processing and shock tube relations for reflected shocks, spontaneous ignition of the aluminium particle cloud is found to take place for reflected shock gas temperatures above 635 K. For increasing Mach numbers, we find a decreasing trend for the ignition delay. Additionally, the burning time is observed to decrease with increasing Mach number, indicating that the burning process is more efficient with increasing gas temperature.</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":"32 8","pages":"691 - 701"},"PeriodicalIF":2.2,"publicationDate":"2022-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00193-022-01108-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4952620","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: 1