数値解析を用いた高効率エジェクタ内部流路形状の検討

抄録

The friction between driving flow and suction flow is known as one of the main loss factors in the ejector. In this paper, the gas ejector efficiency is improved by accelerating suction flow which aims to reduce friction loss between driving flow and suction flow. Design parameters affecting suction mixing section are chosen and 20 cases selected by LHD (Latin Hypercube Design) method are analyzed numerically. 2-dimentional supersonic phenomena including shock wave are simulated. Ejector design is optimized to maximize entrainment ratio with response surface computed by RBF (Radial Basis Function) network. As a result of design optimization, entrainment ratio is 27% improved compared with conventional design. Evaluation of total pressure loss at each section of the ejector concludes that suction flow acceleration reduces loss in the mixing section and improves the entrainment ratio.