On-Design and Off-Design Performance of Variable Area Ejectors: A Comparative Study of Constant Rate of Momentum Change and Constant Rate of Kinetic Energy Change Methods

IF 2.6 Q2 THERMODYNAMICS

Heat Transfer Pub Date : 2025-06-29 DOI:10.1002/htj.70013

Virendra Kumar, Paruchuri M. V. Subbarao

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Abstract

The design of the ejector is crucial, as the overall performance and efficiency of the system depend on its internal geometry, dimensions, and flow characteristics. The present experimental study compares the performance of variable area ejectors developed based on the “constant rate of momentum change (CRMC)” and “constant rate of kinetic energy change (CRKEC).” The pressure recovery ratio (PRR) and entrainment ratio (ω) at on-design operating conditions were computed based on experimental results. The study also optimizes both the ejector's entrainment ratio at off-design conditions and the impact of nozzle exit positions. CRMC ejectors provide higher entrainment ratios (0.512) and lower PRRs (0.178), while CRKEC ejectors provide slightly higher PRRs (0.18) and lower entrainment ratios (0.5) at on-design conditions. The results indicate that both variable-area ejectors based on CRMC and CRKEC have their own advantages and limitations regarding performance and suitability for specific applications.

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变面积喷射器的设计与非设计性能：恒动量变化率与恒动能变化率方法的比较研究

喷射器的设计至关重要，因为系统的整体性能和效率取决于其内部几何形状、尺寸和流动特性。本实验研究比较了基于“恒动量变化率”和“恒动能变化率”的变面积喷射器的性能。根据实验结果计算了设计工况下的压力恢复比（PRR）和夹带比（ω）。该研究还优化了非设计条件下喷射器的夹带比和喷管出口位置的影响。在设计条件下，CRMC喷射器具有较高的夹带比（0.512）和较低的PRRs(0.178)，而CRKEC喷射器具有略高的PRRs（0.18）和较低的夹带比（0.5）。结果表明，基于CRMC的变面积喷射器和基于CRKEC的变面积喷射器在性能和特定应用适用性方面各有优缺点。

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来源期刊

Heat Transfer THERMODYNAMICS-

CiteScore

6.30

自引率

19.40%

发文量

342