利用流固耦合模擬斜盤往復式壓縮機熱流場

Heat and Flow Simulation of Swash Plate Compressor Utilizing Fluid-Structure Interaction

蔣定承(Ding-Cheng Jiang)

指導教授 ： 陳慶耀

國立交通大學/工學院/機械工程系所/碩士(2020年)

摘要

本研究利用流固耦合模擬車用空調系統中常見的斜盤往復式壓縮機，並且使用常見冷媒R-134a作為工作流體。透過流場與固力場間的資料交換，不僅能模擬出流場現象，也能利用流場對固力場的作用力算出簧片閥的形變後使流場的固體邊界產生形變與位移。為了減少因網格建立限制上可能造成的洩漏情形，吾人也利用了多孔隙介質，藉由在特定時間區間增加慣性損失減少洩漏。吾人利用動網格模擬活塞在壓縮機內運作的情形，並且網格會隨之增加或減少，另外也被用在確保流場中簧片閥的固體邊界移動時的網格品質。吾人嘗試了不同模型並改變下列三項參數以觀察其對壓縮機內部熱流場的影響: 工作流體進口壓力、活塞行程以及壓縮機轉速，並且觀察改變後的壓力、溫度、作功、進出口質量及進出口簧片閥開度。

關鍵字

壓縮機 ； 動網格 ； 流固耦合 ； 多孔隙介質 ； 簧片閥

並列摘要

This study utilized fluid-structure interaction as a method to simulate a swash plate compressor which is often used in automotive air conditioning system. By transferring data between fluid and solid field, not only can the flow characteristics be simulated, but also the deformation of the solid boundary which was calculated from the force applied on the reed valve. To reduce the leakage caused by the restriction of mesh construction, this study applied porous media between certain time intervals by increasing the inertial loss. Dynamic mesh was applied to simulate the piston motion in the compressor, which was also used to assure the mesh quality while the reed valve boundary deforms. This study tried different models and changed three different parameters in order to observe the changes of flow characteristics, which were inlet flow pressure, stroke, and compressor speed, and furthermore the outcomes of pressure, temperature, work, inlet and outlet mass flow and the valves’ opening angle were observed.

並列關鍵字

compressor ； dynamic mesh ； fluid-structure interaction ； porous media ； reed valve

參考文獻

[1] Tian, C., Liao, Y., and Li, X., 2006, "A mathematical model of variable displacement swash plate compressor for automotive air conditioning system," International Journal of Refrigeration, 29(2), pp. 270-280.

[2] Tian, C., Xu, H., Zhang, L., and Li, X., 2009, "Experimental investigation on the characteristics of variable displacement swash plate compressor," Applied Thermal Engineering, 29(14-15), pp. 2824-2831.

[3] Jomde, A., Bhojwani, V., Kedia, S., Jangale, N., Kolas, K., Khedkar, P., and Deshmukh, S., 2017, "Modeling and simulation performance of reed valve in linear compressor," Materials Today: Proceedings, 4(8), pp. 7228-7233.

[4] Gasche, J. L., Barbi, F., and Villar, M. M., 2012, "An efficient immersed boundary method for solving the unsteady flow through actual geometries of reed valves," International Compressor Engineering Conference.

[5] Gasche, J. L., Dias, A. D. S. d. L., Bueno, D. D., and Lacerda, J. F., 2016, "Numerical simulation of a suction valve: comparison between a 3D complete model and a 1D model," International Compressor Engineering Conference.