Numerical Investigation on the Internal Flow Field of Electronic Expansion Valve as the Throttle Element
2022-01-0378
03/29/2022
- Content
- As one of the key components of the heat pump system, the electronic expansion valve mainly plays the role of throttling and reducing pressure in the heat pump system. Firstly, a three-dimensional fluid model is established. The grid is divided and the grid independence is verified. Then, the internal flow field of the electronic expansion valve is numerically simulated based on the fluent software, and the pressure field, velocity field and flow rate changes are analyzed. The flow characteristics of the valve are theoretically analyzed according to the principle of the fluid passing through the orifice. Secondly, the flow characteristics of the valve are simulated, and the theoretical values, CFD simulation results and experimental values are compared to verify the correctness of the established three-dimensional fluid model. Then the influence of geometric parameters such as the diameter and cone angle of the spool on the flow characteristics is studied. The steady-state hydraulic force of the spool is investigated under different opening degrees and a theoretical analysis of steady-state hydraulic force is made according to the momentum theorem. Then the changes in the steady-state hydraulic force of the spool are studied under different inlet and outlet pressure differences and different spool diameters and cone angles. Dynamic mesh technology is used to study the movement of the spool and a user-defined function (UDF) is used to set the movement speed of the spool, when transient simulation of the electronic expansion valve is done. Meanwhile, the changes in inlet flow and profile pressure are researched during the opening and closing of the spool.
- Citation
- Liang, G., Li, L., and Shangguan, W., "Numerical Investigation on the Internal Flow Field of Electronic Expansion Valve as the Throttle Element," SAE Technical Paper 2022-01-0378, 2022, .