Abstract
Ejector side-wall pressure distribution is a key indicator of supersonic jet-mixer ‐ejector performance. When documenting pressurepatterns on an ejectorwall using pressure-sensitivepaint (PSP), onehasto considertemperaturevariationscaused by the supersonicjet e owwithin theejector becausethesecan causesignie cantlocalerrors in the PSP results. If the temperature sensitivity of PSP is not corrected for in complex internal supersonic e ows, large localized errors could contaminate the results. In the present work, temperature-sensitive paint maps the temperature distribution on the ejector wall and corrects PSP results point-by-point for temperature sensitivity. The experiments were conducted on multijet supersonic mixer ‐ejector cone gurations with straight, convergent (6-deg), and divergent (6-deg) side walls. A comparison of corrected and uncorrected PSP readings shows that at Mj = 1:55, the error with respect to true data from static pressure ports can be reduced from 4.98 to 2.84% for the case of a simple ejector with parallel walls. For the complex 6-deg convergent ejector at Mj =1:39, the error reduces by almost an order of magnitude (from 20.83 to 2.66% ). Ourresults indicatethat the use of this correction technique can signie cantly reduce PSP errors in complex internal supersonic e ow situations.
Published Version
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