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정진도,水谷幸夫 한국에너지학회 1994 에너지공학 Vol.3 No.1
계단형태의 고온발생장치로서, 고온의 흐름을 형성하고 난류유동이 없이 일정한 혼합기류를 만들 수 있는 2단격막구조 충격파관 장치를 이용하여, 혼합을 동반하지 않는 분무의 착화과정에 관한 실험을 수행하였다. 본 실험에서는 충격파관 속에 하향으로 설치된 초음파 분무기에 의해 자유낙하 상태에 있는 예혼합 분무주를 만들어서 반사충격파에 의해 순간적으로 단열압축시켜서 착화 현상을 관찰하였다. 고온영역과 저온영역에서 얻어진 활성화에너지는 큰 차이가 나며 본 연구에서 얻은 착화지연의 실험결과는 통상의 분무착화 실험인 전기로법, 급속압축기법, 고온기류속에 연료를 분사하는 방법과 다른 현상을 보였다. 그 대표적인 결과에 대한 예로는 착화지연에 대한 압력 의존성과 연료분사율의 영향이 일반적인 분무의 결과에 비해 적게 나타났다.
충격파관 장치설계를 위한 유동현상의 해석(1)-계산치와 실험치의 비교-
정진도,수곡행부 대한기계학회 1994 대한기계학회논문집 Vol.18 No.5
The shock tube is a useful device for investigating shock phenomena, spray combustion, unsteady gas dynamics, etc. Therefore, it is necessary to analyze exactly the flow phenomena in shock tube. In this study, the mechanics of its reflected shock zone has been investigated by using of the one-dimensional gas dynamic theory in order to estimate the transition from initial reflection of shock wave region. Calulation for four kinds of reflected shock tube temperature (i.e. (a) 1388 K (b) 1276 K (c) 1168 K (d) 1073 K) corresponding to the experimental conditions have been carried out sumarized as follows. (1) The qualitative tendency is almost the same as in that conditions in region of reflected wave region. (2) High temperature period (reflected shock wave temperature) $T_{5}$, exists 0-2.65 ms. (3) Transition period from temperature of reflection shock wave is far longer than the calculated one. This principally attributed to the fact that the contact surface is accelerated, also, due to the release of energy by viscoity effect. This apparatus can advance the ignition process of a spray in a ideal condition that involved neither atomization nor turbulent mixing process, where, using a shock tube, a column of droplets freely from atomizer was ignited behind a reflected shock.
[論文] 충격파관을 이용한 분무연료의 착화지연에 관한연구
정진도(J. D. Chung),류정인(J. I. Ryu),수곡행부(Mizutani Yukio) 한국자동차공학회 1989 오토저널 Vol.11 No.6
A shock tube technique was developed in which a freely falling droplets column produced by an ultrasonic atomizer was ignited behind reflected shock.<br/> In the present study, the effects of turbulent mixing on the ignition delay of a cetane was decided, also, ignition process was investigated. For the purpose of disturbance of droplets column and mixing, authors installed turbulent lattice in shock tube.<br/> Usually, the ignition delay is so called Arrhenius plot which found break point in the Arrhenius plot on the high temperature side. The rate of misfiring increased rapidly below lO80K, but ignition took place from 838k and luminous flame was seen to spread over the whole section by turbulent lattice.<br/> Length, from end plate to turbulent lattice, was varied with 60,40,20mm.<br/> Also, ignition process was detected by Photo transistor. As a result, it was found that physical factors changed ignition delay greatly and turbulent mixing had a considerable effects in the ignition process.