• 한국유체기계학회 논문집
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• 제9권3호
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• pp.22-28
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• 2006

The discharge coefficient in segmental wedge haying ninety degrees yeller angle for the five kinds of opening ratio with differential pressure taps located at both upstream and downstream of one diameter of pipe was measured. Main purpose of this work is placed on specifying the characteristic of discharge coefficient of a segmental wedge used as a primary element of flow metering devices, and suggestion for the fixed location of pressure taps useful. Although the range of the opening ratio over this work is more expanded than previous studies. The opening ratios of segmental wedge, namely 0.3, 0.4, 0.5, 0.6 and 0.7 were investigated. The Reynolds number based on the spool inside diameter ranges from 12,000 to 380,000.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2005년도 연구개발 발표회 논문집
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• pp.302-307
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• 2005

The discharge coefficient in segmental wedge having ninety degrees vertex angle for the five kinds of opening ratio with differential pressure taps located at both upstream and downstream of one diameter of pipe was measured main purpose of this work is placed on developing the proper form of an equation for the discharge coefficient of a segmental wedge used as a primary element of flow metering devices, and from thata six-term equation which can express the variability of opening ratios was developed. The same assumption and hypotheses were used and tested for all procedures as conventional differential producers; however, the range of the opening ratio over this work is more expanded than previous studies. The opening ratios of segmental wedge, namely 0.3, 0.4, 0.5, 0.6 and 0.7 were investigated the Reynolds number based on the spool inside diameter ranges from 12,000 to 380,000, the resulting equation for the discharge coefficient is relatively simple; it contains only one variable-opening ratio because the characteristic of discharge coefficient of segmental wedge has little connection with the Reynolds number as shown by previous studies.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2017년도 제48회 춘계학술대회논문집
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• pp.637-642
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• 2017

본 연구에서는 우주발사체의 터빈배기구 열교환기의 입구조건을 모사하는 고온고압 증기 발생장치의 개발을 위해 설계/제작한 엔진 헤드와 구축한 설비를 검증하는 내용을 담고 있다. 단일 분사기를 설계/제작하여 수류시험을 진행했으며, 이를 통해 각 단일 분사기당 설계유량이 공급되는 차압을 확인하고, 분무형태를 patternator를 통해 확인했다. 이를 바탕으로 선정한 분사기로 엔진 헤드를 제작했으며 수류시험과 실추진제 분무시험이 진행됐다. 연소시험을 통해 유량, 압력, 연소효율 등에 대해 분석했으며 이를 통해 고온고압 증기 발생장치 개발을 위한 엔진 헤드 검증을 마쳤다.