|
|
Multi-Factor Coupling Effect of Subsonic Nozzle on Gas Flow Distribution |
ZHANG Han1,JIA Li1,CUI Li-shui2,LI Chun-hui2 |
1. Beijing Jiaotong University, Beijing 100044, China
2. National Institute of Metrology, Beijing 100029, China |
|
|
Abstract In order to study the interaction of gas flow field evolution in subsonic nozzle, the coupling effect of pressure-velocity-contraction ratio on the velocity profile was quantitatively evaluated. Based on the standard k-ε turbulence model, the numerical simulation was utilized for the uniform gas flow field in the subsonic nozzle under coupling effect and the key parameters of top-hat flow field distribution were defined. The results show that within multi-factor coupling, the subsonic nozzle can change the quality of the flow field distribution by influencing the key points of the strengthening process including the equilibrium point and the critical position point of the pressure gradient. Increasing the gas pressure can effectively reduce the boundary layer thickness in the tectonic flow field, reduce the dependence of the key points on the flow velocity in the process, and improve the stability of the boundary layer thickness under different flow velocities. The increase of contraction ratio leads to the further deviation of the flow field from the ideal distribution.
|
Received: 19 November 2020
Published: 23 March 2021
|
|
Fund:National Key R&D Program of China |
|
|
|
[1]Morris A S, Langari R. Measurement and instrumentation: theory and application[M]. Pittsburgh: Academic Press, 2016.
[2]刘正刚, 杜广生, 刘丽萍. 动量式气体流量计内部流场特性与测量性能研究[J]. 计量学报, 2019, 40(1): 124-129.
Liu Z G, Du G S, Liu L P. Study on Internal Flow Field and Measurement Performance of Momentum Gas Flowmeter[J]. Acta Metrologica Sinica, 2019, 40(1): 124-129.
[3]Herschy R. The velocity-area method[J]. Flow Measurement and Instrumentation, 1993, 4(1): 7-10
[4]侯晓春. 高性能航空燃气轮机燃烧技术[M]. 北京: 国防工业出版社, 2002.
[5]崔航, 胡鹤鸣, 李丽霞, 等. 基于激光跟踪仪的超声流量计几何参数实测方法[J]. 计量学报, 2020, 41(9): 1081-1088.
Cui H, Hu H M, Li L X, et al. Geometric Parameter Measurement of Ultrasonic Flowmeter Based on Laser Tracker[J]. Acta Metrologica Sinica, 2020, 41(9): 1082-1088.
[6]邹冰妍, 林鸿, 张亮, 等. 点排放源中二氧化碳浓度的测量研究[J]. 计量学报, 2019, 40(2): 246-251.
Zou B Y, Lin H, Zhang L, et al. Investigation on CO2 Concentration Measurementfor Point Emission Source[J]. Acta Metrologica Sinica, 2019, 40(2): 246-251.
[7]Mickan B, Strunck V. A primary standard for the volume flow rate of natural gas under high pressure based on laser Doppler velocimetry[J]. Metrologia, 2014, 51(5): 459-475.
[8]Mi J, Kalt P, Nathan G J, et al. PIV measurements of a turbulent jet issuing from round sharp-edged plate[J]. Experiments in Fluids, 2007, 42(4): 625-637.
[9]Quinn W R. Upstream nozzle shaping effects on near field flow in round turbulent free jets[J]. European Journal of Mechanics/B Fluids, 2006, 25(3): 279-301.
[10]Xu G, Antonia R. Effect of different initial conditions on a turbulent round free jet[J]. Experiments in Fluids, 2002, 33(5): 677-683.
[11]Chen N. Mechanisms of axis-switching and saddle-back velocity profile in laminar and turbulent rectangular jets[D]. West Lafayette: Purdue University, 2013.
[12]Zhang H, Jia L, Cui L S, et al. The development of top-hat flow field in a circular symmetrical subsonic nozzle[J]. Journal of Thermal Science, 2019, 28(5):975-983.
[13]Zhang Z X, Dong Z N. Viscous hydrodynamics [M]. Beijing: Tsinghua University Press, 1998.
[14]Marinal K, Rakesh K, Humrutha G. Review of computational fluid dynamics studies on jets[J]. American Journal of Fluid Dynamics, 2015, 5(3a): 1-11. |
|
|
|