• 한국항공우주학회지
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• 제31권5호
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• pp.87-92
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• 2003

일반적으로 연소과정에서 발생한 고온고압의 연소가스로 인하여 액체추진기관의 연소실 및 노즐 벽면 그리고 추진기관 후방부위에 대류열전달과 복사열전달이 발생하는 것으로 알려져 있으며, 액체추진기관에서 발생하는 복사열전달 현상은 재생냉각장치의 열입력랑 예측 및 발사체의 추진기관 후방부위에 탑재되는 전자장비 및 구조물의 열적 환경을 분석하는데 매우 중요하다. 이에 본 연구에서는 노즐 후방부위에서 발생하는 복사열전달량을 측정하고 연소압과 혼합비에 따른 영향을 파악하였다. 동알한 형상의 소형 액체추진기관에서 연소압(200, 300, 400 psi)과 혼합비(1.5, 2.0, 2.5)에 따른 복사열전달의 특성을 파악하기 위하여 각각 3가지 조건에 대하여 연소시험을 수행하여 복사열전달량을 측정하였다. 시험 결과로부터 연소가스에서 발생하는 복사열전달의 상대적인 크기 및 미치는 인자들을 파악할 수 있었다. 본 연구를 통하여 석영을 활용하여 복사하는 복사열전달의 크기 및 현상을 파악할 수 있었다. 또한, 연소실 및 노즐에서 발생하는 복사열전달 현상을 파악할 수 있었다

• 한국연소학회:학술대회논문집
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• 한국연소학회 2014년도 제49회 KOSCO SYMPOSIUM 초록집
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• pp.67-70
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• 2014

We performed computational simulation for a heat recovery steam generator to predict emissions (especially carbon monoxide) and compare the results with experimental data. We used the steady laminar flamelet model(SLFM) which can consider detailed chemical mechanisms. To reduce the number of grid, we simplified the geometry of the whole heat recovery steam generator. In conclusion, the trend of simulation results is good agreement with experimental data.

• 동력기계공학회지
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• 제2권2호
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• pp.20-26
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• 1998

Heat release data were obtained by analysis of cylinder diagrams from a test engine, naturally-aspirated small-size four-stroke DI diesel engine. These data were used to decide empirical coefficients of Whitehouse-Way's model, single zone combustion model. Finally, the comparison of calculated with experimental results was performed, and the accuracy of calculated versus experimental data of the model in predicting engine heat release and cylinder pressure was demonstrated.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2006년도 추계학술대회
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• pp.157-160
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• 2006

The Dish/Stirling system with the Stirling engine is currently used to convert solar energy directly to electrical energy successful operation of dish/Stirling system is supported by hybrid system, which will allow continuous operation driven by solar and combustion heat ins. The hybrid Receiver has to be provided with an additional combustion system. The heat pipe receiver and conbustion system were manufactured and tested for thermal characteristics of receiver. Maximum temperature difference along the heat pipe surface is $200^{\circ}C$. Emission measurements showed low NOx values of 28 to 46 ppm and very high CO values of 18 to 201 ppm.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 추계학술대회
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• pp.79-84
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• 2003

In this study we propose an unsteady I-dimensional model of an iron ore sintering bed with multiple solid phases, which confers a phase on each solid material. This model contains coke combustion, limestone decomposition, gaseous reaction, heat transfers between each phase, and geometric changes of the solid particles. Simulation results are compared with the limited experimental data set of various coke contents and air supply rates. Effect of the coke diameter is also evaluated. They predict the experimental results well and show applicabilities to the various system of the fuel bed with various solid materials.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2012년도 제44회 KOSCO SYMPOSIUM 초록집
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• pp.41-42
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• 2012

Circulating fludized bed(CFB) furnace which can use a variety of low-grade fuels because of high heat capacity and good mixing characteristic in its furnace have turned out to be effective system. There is no many research to design CFB boiler in korea. thus, we feel necessity to research design method. So far accurate hydrodynamics and combustion mechanism information in CFB furnace has been lacked. Therefore, design method that derives design parameter is being made. so, this study is aimed to derive design parameters of CFB furnace from heat and mass balance by using existing plant data.

• 한국연소학회지
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• 제9권3호
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• pp.19-26
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• 2004

This paper presents results of experimental study of flame chemiluminescence from turbulent premixed flames in a dump combustor. A detailed spectroscopic measurement of chemiluminescence over the wavelength of 405-495 nm is made for various flow conditions. No effect of turbulence on the relationship between chemiluminescence and heat release is found, suggesting the overall chemiluminescence intensity collected be used as a measure of overall heat release for non-oscillating stable flame. The background-$CO_2^*$ subtracted $CH^*$ chemiluminescence is found to be more sensitive to the equivalence ratio and premixedness of fuel-air mixture than $CO_2^*$ chemiluminescence.

• 한국화재소방학회논문지
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• 제26권4호
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• pp.63-69
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• 2012

폭발한계는 가연성물질의 폭발위험성을 결정하는데 중요한 특성치 가운데 하나이다. 본 연구에서는 연소열과 화학양론계수를 이용하여 유기할로겐화탄화수소의 폭발하한계와 상한계를 예측하였다. 제시된 예측식에 의한 폭발한계 값은 문헌값과 적은 오차범위에서 일치하였다. 제시된 방법론을 사용하여 다른 가연성 유기할로겐화탄화수소류의 폭발한계 예측이 가능할 것으로 판단된다.

• 대한기계학회논문집B
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• 제24권11호
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• pp.1486-1496
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• 2000

The initial flame kernel development and flame propagation in a constant volume combustion chamber is analyzed by the heat release rate and the mass fraction burnt. The combustion pressure is measured with a piezoelectric type pressure sensor. In order to evaluate the effects of ignition system and ignition energy on the flame propagation, four different ignition systems are designed and tested, and the ignition energy is varied by the dwell time. Several different spark plugs are also tested and examined to analysis the effects of electrodes on flame kernel development. The results show that the when the dwell time is increased, and when the spark plug gap is extended, heat release rate and the mass burnt fraction are increased. The materials and shapes of electrodes affect the flame development, because they change the energy transfer efficiency from electrical energy to chemical energy. The diameter of electrodes influences not only the heat release rate but also the mass burnt fraction as well.

• 한국대기환경학회지
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• 제33권5호
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• pp.521-528
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• 2017

In the combustion treatment of explosive gases with a high heating value such as $H_2$ and $NH_3$ used in semiconductor and chemical processes, the heat recovery modeling and exergy analysis of the process using the Aspen Plus simulator and its thermodynamic data were performed to examine the recovery of high temperature thermal energy. The heat recovery process was analyzed through this process modeling while the exergy results clearly confirmed that the rigorous reaction mainly occurs in the condenser and the chamber. In addition, the process modeling demonstrated that approximately 95% of the exergy is destructed on the basis of the exergies injected and the exergy being exhausted. Using the exergy technique, which can quantitatively analyze the energy, we could understand the energy flow in the process and confirm that our heat recovery process was efficiently designed.