 Wysłany: Nie 16:52, 28 Lis 2010 Temat postu: ugg botas Three-dimensional turbulent flow field i |
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| Three-dimensional turbulent flow field numerical combustion chamber
T25000 gas turbine combustion chamber with a single-tube counter flow flame tube diameter 175n Ⅱ n, diameter of 164m, flame tube length is 522nm, with cone-shaped flame tube imports Vane, flame tube wall with primary holes were doped mixed holes and cooling holes. Rated state, the chamber inlet air mass flow rate of 78.26kg / s, the flame tube flow of air quality, 65.85kg / s, to flow uniformly jet fuel and air mixture. 62 The Calculation of state rated condition, the combustion chamber inlet air total pressure P b 2.0523 cricket, the air temperature is 769.9K, the total combustion air excess coefficient is 3.316, after cyclone excess air coefficient is 0 .445, flame tube excess air coefficient is 2.79. Flame tube main combustion air, fuel, jet hole and the second hole of population mixing are used velocity boundary; flame tube wall, a constant wall temperature boundary, temperature is taken as l230K (about 950 ℃); flame tube exit section with pressure boundary, pressure is taken as the 0.1MP ugly, the temperature is 300K. Flame tube wall on the airflow velocity and turbulence parameters taken to zero, close to the wall using the wall function. The results shown in Figure 7 results from 2 shown in Figure 6. Figure 2 Symmetric 2.60 Coconut 2.42c +03'2 .24 c +032.07 c +03 I. 89c +03 I. 7lc +03 I4c +031.36 c +03 I. 18c Bei 1.01c +0330 c +026.53 c +02 r''+0 zj3.00c ~ 2 & 40c +0 l7.76c +017.1 lc +0 l Figure 2 symmetric surface temperature field r, z-x plane of symmetry the velocity field in Figure 3 rz-x; Figure 4, the pressure field symmetry plane state of the state ideological coconut Ⅷ Ⅷ flail flail Shenzhen Shí Shí increase Qin Hu mantle mantle yu} m rise of Rights also glancing Rights ~ li * Thermal Power Engineering 2001, 82 positive and the temperature field. The figure shows that in post-cyclone combustion zone near the main gas temperature is high, and in the combustion chamber outlet, for mixing the cooling air to enter,ugg botas, so that gas temperature is reduced, the gas turbine blades to meet the temperature requirements. Flame tube near the wall, due to film cooling, a flame tube material to meet the low-temperature requirements. Figure 3 shows the calculated velocity field at the symmetry plane. The figure shows, cyclone center as recirculation, combustion can guarantee the reliability, adequacy and stability. Flame tube near the wall, due to the entry of cooling air, the speed increased by superimposed. Figure 6 shows the calculated temperature at the exit section. The figure shows,ghd styler, the export section temperature distribution uniform, symmetrical shape, it will give the turbine blade heat more reasonable. 3.4k + oo3. 2.78e +00 U snapped on the 44c +000001-74 ~ +00 lj9e + ool_04e + O0'96c. OlFl. 08 Figure 5 symmetry plane radiation field rzLX export section of temperature field in Figure 6 References: [1] Jiao tree construction. Gas turbine combustion chamber [M] Beijing: Mechanical Industry Press, 1981 [2] Yi-Liang Chen. Zhang Xiaochun. Combustion theory [M] Beijing: Aviation Industry Press, 1992. [3] Yan Chuanjun burning three-dimensional body-fitted coordinates Numerical Simulation of Vision [J] Combustion Science and Technology. 1995,1 (1): 54 one knows. [4J Zhao Jian-line, Liu Quanzhong. Numerical simulation of evil axis of the engine combustion chamber Xiang field [JJ. Combustion Science and Technology. 1995, l (4)} 2 a 298 (He Jingfang edit) (then 50) before its cooling effect and improvement of basic similar. However,ugg boots ireland, due to the cost of each cooler than the original lubrication system, compared with the original design, each bearing housing of the manufacturing cost can be reduced. Therefore, this improved design is worth promoting. 6 reflect the economic power, according to Tongliao, average annual change before the transformation pumps, pressure gauges, flow meters and other accessories more than 50 times, to be RMB l4 million (12 mill annual maintenance fee). Transform of the bearing housing, due to take take along a pump,uggs ireland, pressure gauges, flow meters and other accessories, will not only reduce the cost of each bearing housing 2 million, and annual savings of l4 million in maintenance costs. In addition, the improved mill operation will be more stable, eliminates the lubrication system failure caused by the jump mill, greatly reducing the labor intensity of maintenance operation, efficiency is very obvious. After the successful development of this improved method,ugg boots sale, but also fans of Shuangliao mill has been transformed plant, also achieved good results. References: [1] Jiang Hongli. SKF Bearing comprehensive volume recorded [M]. Shanghai: Shanghai Scientific and Technical Documents Publishing House. 1991. (Re-edit) mm ∞ which briefly a little bit too Rights ~ Midship sampan _ | a ~  iI_r_. lying _l-ir
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