Influence of Subcooling on Nozzle Efficiency

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Influence of Subcooling on Nozzle Efficiency

更新时间：2025-07-09

- Influence of Subcooling on Nozzle Efficiency
- Vol. 43, Issue 11, Pages: 18-21(2009)
- 作者机构：
  
  1. 西安交通大学流体机械及压缩机国家工程研究中心,西安,710049
  2. 河南科技大学车辆与动力工程学院,河南,洛阳,471003
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK243.3
- Online First：10 November 2009，
  
  Published：2009
- 稿件说明：
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Influence of Subcooling on Nozzle Efficiency[J]. 2009, 43(11): 18-21.
DOI：

Influence of Subcooling on Nozzle Efficiency[J]. 2009, 43(11): 18-21. DOI：

摘要

为研究流体过冷度对喷嘴工作性能的影响

研制了两相流体混合速度的测试装置.基于动量定理

测定两相流体的质量流量和冲击力

从而得到质量平均的流体混合速度.利用R410A制冷系统实验台

实验研究了制冷剂过冷度对喷嘴出口流体混合速度及喷嘴能量转化效率的影响.实验表明:随着入口制冷剂过冷度的提高

喷嘴的通过质量流量逐渐增加; 同时

制冷剂过冷度的提高使喷嘴出口流体混合速度及喷嘴转化效率明显下降; 在实验工况下

喷嘴进口为饱和制冷剂时

喷嘴出口制冷剂混合速度达到了94.1 m/s

喷嘴转化效率为64.1%; 当制冷剂过冷度由饱和状态增至11 ℃时

喷嘴出口流体的混合速度降低35.7%

喷嘴转化效率降低33.9%.

Abstract

A velocity-measurement equipment was developed to study the influence of fluid subcooling degree on the nozzle operation performance. The mass flow rate and the impact force were measured and the average mixing velocity of the two-phase fluid was obtained based on the momentum theorem. The influence of fluid subcooling degree on the average mixing velocity of the two-phase fluid at the outlet of LAVAL nozzles and the efficiencies of the nozzles was investigated on a refrigeration system with R410A. The experimental results show that the mass flow rate increased with the increase of the refrigerant subcooling degree at the inlet of the nozzles. However

the increase of upstream subcooling degree resulted in the significant decrease of the refrigerant mixing velocity and the nozzle efficiency. Under test conditions

the refrigerant mixing velocity at the outlet of the nozzle and the nozzle efficiency decreased by 35.7% and 33.9%

respectively

when the upstream subcooling degree increased from 0 ℃ to 11 ℃ for No.2 nozzle.

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Keywords

references

WONGWISES S, DISAWAS S. Experimental study on R-134a refrigeration system using a two-phase ejector as an expansion device [J]. Applied Thermal Engineering, 2008,28(5/6): 467-477.

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HE Tao, LI Liansheng, XIA Chunli, et al. Application of Pelton-type expander to replace throttling valve in refrigeration system [C/CD]∥ Proceedings of the 22nd International Congress of Refrigeration. Beijing, China: International Institute of Refrigeration, 2007:ICR07-E2-958.

JURSKI K, GEHIN E, DEGERATU M, et al. Experimental study of a two-component critical flow in a converging-diverging nozzle [J]. Journal of Aerosol Science, 1996, 27(1): 419-420.

LEAR W E, SHERIF S A, LANGFORD J R. Efficiency and gasdynamic analysis of two phase mixtures in supersonic nozzles with inter-phase heat transfer and slip [J]. Acta Astronautica, 1997, 40(10): 701-706.

FRASER D W H, ABDELMESSIH A H. A study of the effects of the location of flashing inception on maximum and minimum critical two-phase flow rates. Part II: Analysis and modelling [J]. Nuclear Engineering and Design, 2002, 213(1):11-30.

陈听宽. 两相流与传热研究[M]. 西安:西安交通大学出版社,2004.

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