combustion efficiency

• By comparing the results of two different lengths of xiaofang , it is found that the combustion efficiency with a smaller length is higher . moreover , the effect of various structure , such as the lengths of dafang , the angle between xiaofang and dafang is analyzed with a 2d model . the results show that the combustion chamber with smaller angle and length of dafang is better
  通过对不同小方段高度燃烧室计算结果的比较,发现适当的减小小方高度将有助于提高燃烧效率;另外,还针对不同结构参数下的燃烧室二维流场进行了仿真,结果表明在一定范围内增大突扩角和大方段高度可以使燃烧进行得更充分。
• In this paper combustion performances of the single - head annular combustor with different swirler cups are investigated by experiment and numerical simulation . under different fuel - air ratios , profiles of exit temperature 、 combustion efficiency 、 lean blowout limit and pollutant emission are measured
  在相同的双级旋流器情况下,试验分析不同油气比对单头部环形燃烧室的出口温度分布、燃烧效率、贫油熄火油气比以及污染物( co _ 2 、 co和nox )排放等燃烧性能的影响规律。
• But the real performance can be obtained is mainly determined by the ejected secondary mass flow rate , the mixing degree , the mixing efficiency , and the secondary combustion efficiency can be obtained . 2 ) the ejected secondary mass flow rate , the mixing degree and the mixing efficiency are synthetically affected by the configuration of rbcc engine , especially the mixer and the primary nozzle , in which the primary nozzle , including shape , number and distribution mainly determines the mixing degree ; while the mixer configuration primarily determines the mixing efficiency
  而实际能达到的性能则取决于实际的引射比及两种流体的实际掺混程度、掺混效率和二次燃烧效率； 2 )引射发动机的构型，包括后体及一次流喷管的形状、数量、配置等，对引射进来的二次流量、一次流和二次流之间的掺混程度和掺混效率起着主要作用。
• Because of the behindhand facilities and technology of coal combustion , there are certain problems such as low combustion efficiency , serious pollution problems or costly fuel cost in a large number of regular boilers ( including pulverized - coal - fired boilers , chain grate stoker boilers , oil - burning boilers ) in our country
  由于燃烧设备和燃烧技术的相对落后，我国相当一部分的常规锅炉(煤粉炉、链条炉、燃油锅炉)存在不同程度的燃烧效率低下、环境污染严重或者燃料成本昂贵等问题。
• The convective term is solved by ausm + ( a sequel to ausm which means " the advection upstream splitting method " ) . the 7 species 8 steps model and 7 species 7 steps model of hydrogen / air is used in the hydrogen reacting flowfield , the 9 species 5 steps model of methane , the 10 species 10 steps model of ethane and the 10 species 13 steps model of kerosene are used in the hydrocarbon reacting flowfield , the results of the distributions of velocity , mach number , pressure , static temperature , total temperature , species mass fraction and the combustion efficiency are gained , and the numerical results of the pressure of hydrogen and methane are compared with those of the experiment
  计算中通量项采用ausm +通量分裂格式，氢反应流场采用氢/空气的七组元八方程模型和七组元七方程模型，碳氢反应流场采用甲烷的九组元五方程模型、乙烯的十组元十方程模型和煤油的十组元十三方程模型，得出了超燃发动机燃烧室流场的速度、马赫数、压力、静温、总温和组元质量分数分布及燃烧效率等性能参数，其中氢和甲烷的计算压力分布与实验结果进行了比较。
• Meanwhile in the condition of high temperature , water vapors can participate in combustion . water gas reaction will happen , which will reduce carbon particle in flame , and reform combustion performance , so improve combustion efficiency . the article developed a kind of technology of water injection into intake ports for 4135g diesel engine , meanwhile designed a suit of water injection system
  同时在高温条件下，水蒸汽参与燃烧，部分水分子与未完全燃烧的炽热的炭粒发生水煤气反应，形成可燃性气体，从而减少了火焰中的炭粒，提高了油的燃烧程度，改善了燃烧状况，提高了油的燃烧效率。
• The disposal of the valves and intake manifold structure not only affect fresh air charge but airflow in the cylinder , which immediately affect combustion efficiency and the performance of dynamic , economic and emission . the structure of the air distributing institution has influence on charging efficiency and the noise of engine . the combustion chamber affects compression scale which has great influence on dynamical performance ; f / v which affects the exhaust of hc ; squash area and clearance which have great influence on the intensity of squash
  气缸盖的气门排列方式与气道结构形式影响进气充量和气流在气缸内的运动，从而影响了燃烧效率，对整机的动力性、经济性以及排放都有直接的影响；配气机构的形式影响充气系数和整机噪声等；缸盖燃烧室决定了影响整机动力性能的压缩比，影响hc排放的f / v和对挤流起决定性作用的挤气面积以及挤气间隙，所以燃烧室对整机动力性、经济性、排放等都有重要的影响；气缸盖是整机热负荷与热应力最大的部件之一，热负荷过高将不利于发动机寿命以及可靠性的提高。
• Effects of different fuel - air ratios and different geometric parameters of dual - stage swirler ( such as inner diameters of the primary swirl and secondary swirl passages , outer diameters of the secondary swirl passages , vane angle of the primary and secondary swirler , the distance of the flare exit from throat etc ) on combustion performances are studied experimentally . the experimental results show that radial profiles of the outlet gas temperature 、 combustion efficiency 、 emissions of co2 、 co and nox and lean blowout are affected with different degrees by the different geometric parameters of dual - stage swirler and the arrangement of primary holes
  在不同油气比下,不同的双级旋流器几何参数(例如:一级与二级旋流器出口内径d 、叶片安装角、二级旋流器出口外径d 、二级旋流器的喉道到出口截面的距离l和喉道前后的圆弧半径r以及主燃孔孔布局等)对单头部环形燃烧室的出口温度分布、燃烧效率、贫油熄火油气比以及污染物( co _ 2 、 co和nox )排放等燃烧性能的影响规律进行了研究。
• As to the experimental study , a test system was designed firstly , which include propellant feed system , cooling system , controlling system and measure system . secondly , a test engine was designed according to the experimental requirement . on this basis , experiments under different working conditions were done , and the results of them were analyzed , which showed the combustion efficiency and stability
  实验方面，首先设计了针对三组元发动机推力室工作过程进行试验的试验系统，包括推进剂供应系统与冷却水供应系统、控制系统以及压力、温度、流量的测量采集系统；其次，设计出符合试验要求的缩尺发动机；最后针对所设计的试验系统和发动机，进行了不同工况的试验，对所得数据进行了分析处理，得到了不同工况下燃烧效率和燃烧稳定性特性。
• With computations and analysis , the comprehension on the mixing and combustion process is increased , and some significative results are listed below : a ) there are three recirculation regions and one vortex region in the combustor , and these recirculation regions affect the combustion process deeply , b ) increasing side - arm angle and moving side - air inlet position toward the fuel inlet can improve mixing and combustion characteristics , and increase the combustion efficiency , c ) when the angle between two air - inlets equals to 180
  通过计算与分析，增进了对补燃室内掺混燃烧过程的理解，为固体火箭冲压发动机补燃室设计提供了一些有意义的结果： 1补燃室内的流动十分复杂，存在三个回流区和一个旋涡区，回流区对掺混燃烧过程有重要影响； 2增大空气入射角度、向前移动进气道出口位置有利于增强头部回流区强度，增强掺混效果，燃烧效率上升； 3