Jet Performance Optimization of an Ejector For Multi-Parallel Ejector Air Curtain

Abstract

Since conventional fan-driven air curtains are unsuitable for the blood plasma cold storage, the proposed multi-parallel ejector air curtain (EAC) in previous research could address these issues by utilizing compressed air ejectors arranged in parallel, forming an effective air barrier to minimize air infiltration and associated cooling load loss. As the key component of  EAC, the jet performance of ejector plays a significant role in the aerodynamic sealing of the cold storage. The study focuses on optimizing key geometric parameters of the ejector, specifically the area ratio (AR) and the nozzle exit position (NXP). Then the best and the worst configurations of ejector (case 2 and case 5 respectively) were applied to compose EAC for comparatively explore the impact of operational parameters on sealing performance of cold store. Results indicate that the optimal AR and NXP significantly enhance performance of the EAC with a maximum aerodynamic sealing of 66.35%. And compared with the cold storage with the EAC composed of the ejector case 5, the internal average temperature rise and the moisture content were reduced by 0.2 °C and 3.78% respectively when fixed with case 2 ejector ( NXP 15, AR 8.21) air curtain.

Keywords: air curtain, automatic plasma cold storage, ejector, experiment