增压比

通过叶轮三元流动的准正交面法计算得到离心压气机叶轮的增压比。据此对初值不同的Logistic映射序列进行筛选，得到了混沌准正交序列组。

Through a quasi orthogonal calculation of three dimensional flow of the impeller obtained was the pressure ratio of the centrifugal compressor impeller . Chaotic sequences generated from a logistic map with different initial values were checked using the quasi orthogonal criteria to select the qualified sequences .

压气机的加功量或增压比由其基元叶栅的落后角确定。

The compression work or the total pressure ratio of a compressor is determined through the use of cascade element performance data concerning deviation angle .

本文以扩压器叶片数和安装角度为设计变量，以增压比为目标函数，优化结果使压气机的增压比提高了5.6%。

The optimized result makes the pressure radio of the compressor to enchance 5.6 % .

对引射火箭的热力循环分析同样表明，增压比对于提高发动机性能非常关键。

The thermodynamic cycle analysis shows that the increase of pressure in secondary combustor will enhance the performance of rocket ejector .

首先应用发动机热力计算方法导出循环有效效率表达式和最佳增压比解析式，然后对高温气冷堆氦气轮机循环的热力过程进行分析，揭示了各参数之间的关系。

Then , analyzes the thermodynamic process of HTGR gas turbine cycle to show the effects of various parameters on the cycle efficiency .

结果表明：适当提高增压比和加大气门重叠角，是柴油机强化燃烧的重要措施。

The results show that enhancing pressure ratio and increasing valve overlap angle are effective methods to intensify the combustion of the DI diesel engine .

进气道流量系数为0.83，出口总压恢复0.78，马赫数2.01，增压比11.92；

The flow coefficient of inlet is 0.83 , the overall pressure recovery coefficient is 0.78 , with a Mach number 2.01 and a compression ratio of 11.92 ;

用该系统对某级增压比2.2的单级高负荷后掠风扇进行了后掠和前掠大小叶片改型设计。

Using this design system , a high-loaded backward-swept fan with a stage pressure ratio of2.2 was redesigned firstly as a backward-swept and secondly as a forward-swept splittered fan .

炉膛容积热负荷、锅炉的燃料负荷随着增压比的提高成比例增加；随着增压比的增大，烟气与对流受热面的换热增加，蒸发量随之增加；

And volume heat load of the furnace , fuel consumption , heat change between flue gas and convective heating surface and evaporation value would increase with the increase of compression ratio .

本文中压气机叶栅的多目标优化确定为在给定条件下同时追求高增压比和低总压损失系数。

To demonstrate the feasibility of the algorithm , a multiobjective design optimization of cascade airfoils was performed for minimizing the total pressure loss coefficient and maximizing the high pressure ratio at the same time .

前掠叶片的增压比低于无掠叶片，且增压比随前掠程度的增大而降低。

( 3 ) the pressure ration of the forward sweep blade is lower than that of the non-sweep blade , and the pressure ratio is decreased with the increase of the forward sweep degree .

并自行编写了模拟计算程序，对增压比、电磁阀截面积、喷孔面积及数目等设计参数进行模拟计算与仿真，确定各参数对喷油规律的影响，并得出优化的结果。

The design parameters such as the boost ratio , the section area of magnetic valve , the area and number of injection holes are simulated to determine their effects on injection rate , and thus the optimized results are obtained .

合理地匹配控制油道和喷孔面积、针阀升程和开启压力以及增压比等参数，可以进一步扩大系统的可控范围，为喷油性能的优化提供更好的前提条件

After compromising control line section , injection hole section , nozzle lift , opening pressure of injector and intensified ratio , the controllable degree of injection parameters , that are the precondition for optimization of injection performance , can be further improved

所用数据适用于扩散因子大于0小于1，而马赫数在0到1.6之间的情况。压气机的加功量或增压比由其基元叶栅的落后角确定。

The correlated data are used for diffusion factors from 0 to 1 0 and Mach numbers from 0 to 1 6.The compression work or the total pressure ratio of a compressor is determined through the use of cascade element performance data concerning deviation angle .

结果表明，空燃比、压缩比和增压比的增加有利于燃油消耗率的降低，可提高发动机的经济性，但同时会使发动机热负荷和机械应力增加，并可能使发动机发生爆燃。

The results showed that increasing of the air-fuel ratio , compression ratio and the pressure ratio is conducive to the reduction of fuel consumption rate , but at the same time heat load and mechanical stress will increase , which enable the engine deflagration occurred .

论述电动机驱动管道增压压缩机比燃气轮机驱动具有环保和经济两方面优势，是一种发展趋势；

Described are advantages of motor-driven pipeline booster compressor over gas turbine-driven pipeline booster compressor in environmental protection and economy .

而且随着增压器压比和转速的不断提高，叶轮的机械负荷增加，寿命要求更长，成本要求更低。

Moreover , with the continuous improvement of turbocharger compression ratio and rotating speed , not only impeller mechanical load is increased , but also longer life and lower costs are required .

发动机采用涡轮增压技术可以增加比功率，降低比质量，提高经济性，改善排放，减少噪声。

After turbocharging , the power is added , the mass ratio is reduced , the economical efficiency is promoted , the exhaust is improved , and the noise is decreased .

同时，根据计算得到的标定工况和不同负荷下的天然气发动机的进气流量、涡轮增压器的压比等参数，对涡轮增压器进行选型与验证。

At the same time , based on the simulated intake air mass flow rate and the compression ratio of turbochargers , the turbo-chargers for the new designed engines were selected and verified .

介绍了径流增压器压气机压比、最高轮周速度、涡轮混流化、最高废气温度和可靠性等方面的发展现状。

Introduction is given to the state of compressure ratio , maximal wheel tip speed , and maximal exhaust temperature , as well as mix-flow trend of turbine and the reliability of radial turbocharger .

利用该模型可预测喷油规律、增压压力、压缩比等参数对碳烟排放的影响，从而为预测及改善柴油机的碳烟排放提供了一种数值分析的依据。

Taking advantage of this model , the influence of injection rules , turbocharging pressure and compression ratio on soot emission can be predicted , which can be helpful to predict and improve the soot emission of medium speed diesel engine .

随着增压技术向高增压比方向的发展，为了进一步完善柴油机与增压器的匹配性能和提高柴油机的平均有效压力，需要进行一系列增压系统试验研究。

With the development of charging technology to high pressure ratio , in order to improve the matching characteristic of charger and diesel engine and raise diesel engine 's mean effective pressure , much experimental investigation will be done .

采用先进的内燃机试验台架反复测试，对增压中冷柴油机的供油提前角、增压压比、外特性等各项性能参数进行数据采集，并对所采集的数据进行相关分析。

Advanced gas engine test-bed is tested repeatedly to collect and analyze the data parameter of the injection advance , pressure compare and outside characteristics of the supercharging and mid cooling diesel-engines .