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Performance investigation of a novel multi-parameter adjustable ejector with a broad operating range
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DOI：10.1016/j.ijrefrig.2025.01.020.png)
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Abstract
En 中文
Ejectors can be extensively used in industry and other fields, such as fuel cells, etc., to reduce pressure energy loss or recover low-pressure fluids. However, constant-dimension ejectors are difficult to meet with high efficiency under different operating conditions. This paper investigates the dimensional adjustment strategy of adjustable ejectors under varying fluid flow rates and working pressures, analyzing performance before and after adjustment. Computational Fluid Dynamics (CFD) simulations and experiments were conducted for performance testing and verification. The performance advantages of adjustable ejectors under varying operating conditions are highlighted in a new study, which offers both theoretical and experimental backing for broader implementation. The actual working region is innovatively divided according to the working performance of the ejector. The findings reveal that maintaining optimal dimensions is crucial for high performance, especially under fluctuating primary fluid pressures, where nozzle and mixing chamber dimensional adjustments are essential to maintaining efficiency. Experimental results show that adjusting the ejector dimensions (B2) in response to primary fluid pressure increases (1000 kPa to 1300 kPa) maintains the entrainment ratio and improves performance by up to 28.5 %, preventing significant efficiency drops. This research offers significant insights into the practical application and tuning of ejectors in dynamic systems.
Keywords:
Ejector
Adjustable parameter
CFD
Experiment
Entrainment ratio
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