A Determination Method for Rocket Motor Sea-Level Exhaust Velocity According to Plume Expansion Angle

Subjects: Engineering and technical science >> Physics Related Engineering and Technology submitted time 2022-03-17

袁浩翔 闫东峰 郭常超

Abstract：

Global researchers have recently become interested in non-contact measurements of rocket motors, but the primary focus is on the rocket motor's temperature field or mechanical vibration. As a result, non-contact methods were seldom used to measure the exhaust velocity of the rocket motor. Traditional exhaust velocity measurements need complex equipment and have had few references for a lengthy time. Thus, a method for estimating the rocket motor sea-level exhaust velocity was offered, which makes use of the plume expansion angle measured in its image by integrating a one-dimensional compressible adiabatic flow model, the Prandtl-Mayer function in the ambient atmosphere, and the Brent algorithm. The relationship between the plume expansion angle and the sea-level exhaust velocity was determined in this study, and the results were compared to those obtained using the traditional method to verify the new method's accuracy. The estimation results showed that there was a linear relation between the sea-level exhaust velocity and the plume expansion angle, and the relative error compared to the tradition method is less than 2%. Therefore, it was shown this estimation method has a fairly good accuracy.

Peer Review Status:Awaiting Review

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