喷射器极限工况性能的理论与实验研究

Theoretical and experimental study on performance of ejector under limit operating conditions

为了研究喷射器在极限工况下的性能,建立了喷射器极限工况的计算模型,研制了喷射式制冷系统实验台。对使用R134a和R134a/R32质量浓度等比例混合工质的喷射器极限工况性能进行了理论与实验研究,结果表明:在给定工况范围内,喷射器最低引射流体压力随工作流体压力升高而降低,随出口背压升高而升高;喷射器混合段压差随工作流体压力升高而升高,随出口背压升高而降低;理论和实验对比表明,提出的计算模型能较好的预测喷射器在极限工况下的性能。

In order to study the performance of the ejector under the limit operating conditions ,the calculation model based on thermodynamics and fluid dynamics was built, and the experimental installation was developed. Theoretical and experiment studies were carried out on the performance of the ejector under limit operating conditions. R134a and the R134a/R32 mixture in which a mass fraction of R134a is 50% were used as working fluid. Under the given conditions, the results show that the lowest driven fluid pressure increases with a decrease in the primary flow pressure, but decreases with an increase in the ejector back pressure. The pressure difference of mixing section increases with an increase in the primary flow , but decreases with an increase in the ejector back pressure. Calculated values agree well with the experimental results.