Research On Radiative Properties Of Combustion Gases And Experimental Schemes Of Measuring Radiative Properties Of Hydrocarbon Fuel Gases

At high temperatures, thermal radiative properties are basic parameters of thermal design and quantitative research of thermal process. The radiative heat transfer of hydrocarbon fuel is common in liquid fuel engines and thermal devices, and high-temperature gases are important components of combustion chamber and exhaust plume. An accurate assessment of radiation absorption within the fuel rich core of the fire becomes imperative for assessing heat feedback to the fuel source, and accurate fuel spectrum is the prerequisite to simulate the process of radiative heat transfer accurately. At the same time, the infrared radiative properties of the unburned fuel in the engine exhaust plume are important in long-range target detection. Therefore, the spectrum radiative properties of hydrocarbon fuels are indispensable. The radiation of high-temperature combustion gases is an important issue for many fossil combustion systems, but the calculation of gas radiative properties is only a small part of the whole radiative calculation. It should be possible to improve the speed of the calculation and improve the compatibility of the solution of radiative transfer equation, therefore, accurate and effective calculation of real gas models are needed to study the radiative properties of gas in radiative heat transfer.Based on summarizing the experimental facilities of the radiative properties of hydrocarbon fuel gases and models of the combustion gases at home and abroad, study the radiative properties of the hydrocarbon fuel gases and combustion gases. The main contents for this thesis include:1. Propose the design of an experimental setup, which is proposed to measure the radiative properties of hydrocarbon fuel gases. The design of the experimental facility includes three parts: optical system design, the test cell and the supply system. Through comprehensive consideration of pressure and temperature on the measurement results, the bias error is given.2. Study the Combined Wide and Narrow Band Correlated K-distribution Model(CWNBCK), and based on the radiation spectrum of single gases and features of the overlapping bands of gas mixtures, try to optimize the model.3. Use the CWNBCK and the discrete ordinate method to study the radiative heat transfer of combustion products of carbon dioxide, water vapor and other gases, and also do some researches on the radiative heat transfer calculation of gas mixtures and gas and particles mixtures.According to the design, we can measure the radiative properties of hydrocarbon fuel gases in the temperature range of 298-1000K, and the pressure range of 1.0-10 atm. The results of the radiative heat transfer calculated by the CWNBCK model combined with the discrete ordinate method are in good agreement with the SNB and the LBL models, but with less time and increased computing flexibility.