Acoustic characterization of jet interaction with launch structures during lift-off

Karthikeyan, N and Venkatakrishnan, L (2017) Acoustic characterization of jet interaction with launch structures during lift-off. Journal of Spacecraft and Rockets, 54 (2). pp. 356-367. ISSN 00224650

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Official URL: https://arc.aiaa.org/doi/pdf/10.2514/1.A33616

Abstract

The structures that constitute the environment surrounding the launchvehicle affectthe noise levels experiencedbyit during liftoff. Earlier studies modeled the launch scenario by incorporating a jet impinging on plate geometries,either flat or curved, ignoring contributions from the components of the launch structures such as the launchplatform. Very little is knownaboutthe effect of the structures on the propagationof noise from the jet exhaust towardthe vehicle. This renders any effort to modify them for noise reduction quite challenging. The present study attemptsto address this concern by investigating the contribution of a principal launch structure component, namely, thelaunch platform, toward the acoustic and flowfield around a generic launch vehicle exhausting on a generic jet blastdeflector. The measurements include flowfield visualizations and aeroacoustic measurements using microphones inthe near and far field. The results indicate that the presence of the launch platform increased the noise levelsexperienced by the vehicle beyond certainL∕De. It is also observed that replacing the solid launch platform with aperforated one leads to lower levels of noise compared to the solid one but still higher than the case where launchplatform is absent.

Item Type: Article
Subjects: ENGINEERING > Fluid Mechanics and Thermodynamics
ENGINEERING > Mechanical Engineering
Depositing User: Mrs SK Pratibha
Date Deposited: 03 Jul 2019 11:30
Last Modified: 03 Jul 2019 11:30
URI: http://nal-ir.nal.res.in/id/eprint/13163

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