Volume 7: Fluids Engineering最新文献_第8页

Experimental Analysis of Air Flow in a Channel for Unconventional Radiator 非常规散热器通道内气流的实验分析

Volume 7: Fluids Engineering Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-88332

S. Salman, Rishabh Sharma, K. Suri, Zeshan Muhamed Khetani, Muhammad Taha Junaidy, Jonatan Meza, J. Khan

{"title":"Experimental Analysis of Air Flow in a Channel for Unconventional Radiator","authors":"S. Salman, Rishabh Sharma, K. Suri, Zeshan Muhamed Khetani, Muhammad Taha Junaidy, Jonatan Meza, J. Khan","doi":"10.1115/IMECE2018-88332","DOIUrl":"https://doi.org/10.1115/IMECE2018-88332","url":null,"abstract":"The automotive industry is one of the fastest growing industries worldwide with millions of vehicle productions and sales every year globally. Some of the vehicles have their engines in rear end, which means there is no incoming airflow from the front and the engine cannot cool down efficiently. The main aim of the research is to study the flow behavior for a duct that can detour the incoming air to the radiator for vehicles those have their engines located at the back. The duct collects the incoming air from the front of the vehicle and detour it to the engine located at the back. This helps in cooling down the engine in order to protect it from being overheated. The research is conducted to understand the detailed parameters to be accounted for while designing such a prototype. It is important to understand the essence of a cooling effect as the efficiency of the vehicle engine can only be maintained under a stable temperature. The research is important as it can be applied to diverse engineering problems. There are three cases for the experiment, each with different lengths. However, the inlet and outlet have identical dimensions for all three cases. There is a certain scale factor used to scale down the dimensions from a previously studied CAD model. These scaled down dimensions are then utilized to fabricate the prototype. Once the model has been constructed, a mesh is located at the outlet, which helps recording velocity magnitude and direction at each of the respective node of the mesh. One of the key elements of the research is to extensively understand the type of flow at different points of the duct and how they affect the efficiency of the design. For example, the curved parts where channels are installed along the length of the duct experience turbulent air flow. Hence, it is important to understand the influence of these flows on the efficiency of the design.","PeriodicalId":229616,"journal":{"name":"Volume 7: Fluids Engineering","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133452442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Using Experimental Fluid Dynamics and Computational Fluid Dynamics for Evaluating Periodic Mixing 用实验流体力学和计算流体力学评价周期性混合

Volume 7: Fluids Engineering Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-88531

J. Bamberger, L. Pease, K. Recknagle, C. Enderlin, M. Minette

引用次数: 0

Pulsatory Mixing of Laminar Flow Using Bubble-Driven Micro-Pumps 利用气泡驱动微泵进行层流脉动混合

Volume 7: Fluids Engineering Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-86937

B. Hayes, Austin C. Hayes, M. Rolleston, Alexander Ferreira, J. Krisher

引用次数: 7

Viscoplastic Fluid Flow Between Parallel Plates With Triangular Obstacles 具有三角形障碍物的平行板间粘塑性流体流动

Volume 7: Fluids Engineering Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-87105

N. Ashrafi, A. Sadeghi, A. Chegini

引用次数: 0

Development of the Pneumatic Non-Contact Holder 气动无触点固定器的研制

Volume 7: Fluids Engineering Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-86618

T. Tsukiji, R. Kondo

引用次数: 0

On the Aspects of a Convergent Shock Wave Impinging a Perturbed Density Interface 收敛激波撞击微扰密度界面的若干问题

Volume 7: Fluids Engineering Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-88098

E. Proaño, B. Rollin, Dongeun Seo

{"title":"On the Aspects of a Convergent Shock Wave Impinging a Perturbed Density Interface","authors":"E. Proaño, B. Rollin, Dongeun Seo","doi":"10.1115/IMECE2018-88098","DOIUrl":"https://doi.org/10.1115/IMECE2018-88098","url":null,"abstract":"The detailed characterization of a fluid flow following a convergent shock wave impinging a perturbed density interface is an extremely complex task as this flow combines geometry effects, compressibility effects and turbulence. Nonetheless, more understanding is necessary to be able to develop models that help accurately predict the flow behavior when occurring in engineering applications. Such an application is Inertial Confinement Fusion (ICF), where turbulent mixing induced by the interaction of the shock wave with the fuel pellet is detrimental to the fusion process. This interaction triggers mixing due to baroclinic vorticity deposition at the density interface in a phenomenon known as the Richtmyer-Meshkov Instability (RM). Next, the Rayleigh-Taylor Instability (RT) is driving the final growth of the mixing layer limited by secondary instabilities such as the Kelvin-Helmholtz Instability (KH). These classical hydrodynamic instabilities (HI) trigger the mixing process that leads ultimately to a highly-mixed fluid layer. For this study, we simulate a cylindrical Sulfur hexafluoride (SF6) target immersed into an air medium. The incident shock wave is regarded as a Chisnell-type converging shock wave impinging into a perturbed cylindrical density discontinuity generated with a wave-like spatial perturbation spectra. Parameters of interest are the growth rate and width of the mixing layer at the density discontinuity. This study aims at describing and quantifying relevant aspects of these flows coupling mixing layer growth with perturbation modes.","PeriodicalId":229616,"journal":{"name":"Volume 7: Fluids Engineering","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123065083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pilot Scale Experimental Study of Slug Flow Phenomena Using PID Control 基于PID控制的段塞流现象中试研究

Volume 7: Fluids Engineering Pub Date : 2018-11-09 DOI: 10.1115/imece2018-88565

J. McClung, D. Schmidt, Derek W. Staal, M. Behl, M. Tyagi

{"title":"Pilot Scale Experimental Study of Slug Flow Phenomena Using PID Control","authors":"J. McClung, D. Schmidt, Derek W. Staal, M. Behl, M. Tyagi","doi":"10.1115/imece2018-88565","DOIUrl":"https://doi.org/10.1115/imece2018-88565","url":null,"abstract":"Slug flow is a major problem to the structural integrity and production equipment in offshore production platforms. Pressure oscillations due to the alternation of liquid and gas phases in slug flow regime can cause fatigue on the structural components of the platform. Also, the intermittent high flow rates can cause adverse effects on the production equipment.\u0000 A 28-foot pilot scale model was constructed to simulate the riser on offshore platforms. Three pressure sensors were attached to the model to monitor and record pressures in the riser during operations. A PID control strategy was utilized to regulate the pressure oscillations in the system by use of a linear actuated valve. Similarity between the pressure signals in the pilot scale model is qualitative when compared to actual pressures observed in an offshore riser system. A MATLAB® GUI was designed to allow for manipulation of the valve and allow for instant graphing of data for real time visualization of the pressure signals.\u0000 Pressure oscillations during slug flow with “no control” vary greatly and result in natural vibrations of the designed system. By pinching down on the choke valve to a designated opening, the back pressure in the riser increased, thereby slowing down the liquid slugs. However, an increase in the magnitude of the higher frequency oscillations can have adverse effects on the system. With the implementation of an active control, such as a linear actuated valve, a better control of back pressure on the riser and reduction in the magnitude of the higher frequency oscillations on the system is achieved.","PeriodicalId":229616,"journal":{"name":"Volume 7: Fluids Engineering","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122734234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Downwind Two-Bladed Wind Turbine Aerodynamic Performance Evaluation Implementing Actuator Line Model 实现作动器线模型的顺风双叶片风力机气动性能评价

Volume 7: Fluids Engineering Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-86549

S. Henao, Aldo G. Benavides, O. López

引用次数: 1

Degradation of Hydrophobic Surface Coatings Under Water Exposure 疏水表面涂层在水中的降解

Volume 7: Fluids Engineering Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-87860

Matthew Trapuzzano, R. Guldiken, A. Tejada-Martínez, N. Crane

引用次数: 0

Numerical Simulation on Aerodynamic Performance of Ram Air Turbine Based on Mixed Flow Field 基于混合流场的冲压空气涡轮气动性能数值模拟

Volume 7: Fluids Engineering Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-88304

Zhang Xiangbo, S. Ding, Farong Du, Fen-zhu Ji, Shengrong Guo

{"title":"Numerical Simulation on Aerodynamic Performance of Ram Air Turbine Based on Mixed Flow Field","authors":"Zhang Xiangbo, S. Ding, Farong Du, Fen-zhu Ji, Shengrong Guo","doi":"10.1115/IMECE2018-88304","DOIUrl":"https://doi.org/10.1115/IMECE2018-88304","url":null,"abstract":"Ram air turbine (RAT) is an emergency power source to supply power in case of the main engine and auxiliary engine lost power. Which can extract energy from airflow through rotating turbine. So it is important to investigate turbine aerodynamic performances. According to some type of RAT, we established a numerical model based on Navier–Stokes equation in rotating frames of reference. Calculation domain is divided into three fluid domains. All three regions are linked in the form of interface. Aerodynamic performance of RAT is simulated with computational fluid dynamics (CFD) soft. The extracted power and rotor power coefficient are analyzed under different running conditions. Next, we also investigate RAT aerodynamic performance at different pitch angle and turbine speed. The pressure and velocity distribution on the blade surface are studied. Besides, the method of multiple rotation frame (MRF) is used to simulate mixed flow field of the RAT which pitch angle is adjustable. The simulation results show that: turbine output power and rotor power coefficient can meet the needs of aircraft by adjusting the pitch angle under various operation conditions. The optimal operating point could be obtained by calculating RAT aerodynamic performance. The distribution of blade surface pressure and velocity could provide an important reference for the optimization of turbine blade designing. MRF can be used to calculate turbine aerodynamic performance.","PeriodicalId":229616,"journal":{"name":"Volume 7: Fluids Engineering","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114834435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1