Empirical Prediction of Acoustic Load of Launch Vehicle Including Jet Impingement

Seoryong Park; Kyuho Lee; Byunghak Kong; Kyung Tai Kang; Seokjong Jang; Soogab Lee

doi:10.7776/ASK.2014.33.3.153

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2014 Vol.33, Issue 3 Next Page

Empirical Prediction of Acoustic Load of Launch Vehicle Including Jet Impingement 충돌제트 현상을 고려한 발사체 음향하중의 경험적 예측

31 May 2014. pp. 153-162

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Abstract

Empirical prediction method of the acoustic load on the fairing is based on jet experimental data on the basis of similarity principle. Representative empirical prediction method, DSM-II(Distributed Source Method-II), is a distributing source method along the jet plume. But the empirical prediction model is limited to reflect the impingement source in real environment because it is based on the free jet data. So, we propose a empirical prediction method considering the impinging jet effect by adding a impingement source in the existing prediction method. Considering the additional source's displacement, spectrum, strength and directivity, we calculate the acoustic load on the KSR-III(Korean Sounding Rocket-III) rocket and compare the results with the existing method and experiment data.

Keywords

Launch vehicle

Acoustic load

Empirical prediction method

Impinging jet

Acoustic power spectrum

경험적 음향하중 예측 방법은 우주 발사체 상단 페어링에 가해지는 음향하중을 예측하는 방법으로 상사성 원리를 기반으로 한 제트 실험 데이터를 기반으로 한다. 대표적인 경험적 예측기법인 DSM-II(Distributed Source Method-II)는 제트 화염 축을 따라 소음원을 배치하는 방법이다. 그러나 이러한 경험적 예측 모델은 자유제트 실험 결과를 기반으로 하였기 때문에 실제 상황에 존재하는 충돌 소음원을 고려하기 어렵다는 한계가 있다. 따라서 본 논문에서는 기존 예측 방법에 충돌 소음원을 추가 배치함으로써 충돌 제트 효과를 반영하는 예측 방법을 제안하였다. 이를 위하여 소음원의 위치, 스펙트럼, 세기, 방향성 특징을 고려하였으며 KSR-III(Korean Sounding Rocket-III) 로켓에 대한 음향하중 예측 결과를 기존 예측 방법 및 실험 결과와 비교하였다.

키워드

발사체

음향하중

경험적 예측기법

충돌제트

음향파워 스펙트럼

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Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 33
No :3
Pages :153-162
Received Date : 2014-03-07
Accepted Date : 2014-04-06
DOI :https://doi.org/10.7776/ASK.2014.33.3.153

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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