A Study on Ejector Verification Using Natural Intake Method

When constructing a high-altitude test facility using a diffuser and an ejector, a verification test for each part is required. This study proposes a natural intake method to independently verify the ejector. The proposed natural intake method enables a verification process without a secondary flow supply facility. To confirm the validity of the verification via the natural intake method, a sub-scale cold-flow test, and a full-scale combustion test are performed. First, the sub-down cold-flow test shows that the performance of the proposed method is similar to that of the conventional approach using the secondary flow supply facility in terms of vacuum pressure. In addition, through the full-scale combustion test, the ejector performance of the proposed method is about 26% lower than that of the conventional method (i.e., high-altitude test) due to the difference between the L/D of secondary flow supply part.