engine pressure ratio 中文意思是什麼

engine pressure ratio 解釋
發動機壓力比
  • engine : n. 1. 機械，機器。2. 引擎，蒸汽機，發動機。3. 機車，車頭。4. 工具；〈古語〉方法，手段。vt. 給…安裝發動機。
  • pressure : n 1 壓；按；擠；榨。2 【物理學】壓力，壓強；大氣壓力；電壓。3 精神壓力，政治[經濟、輿論等]壓力。4...
  • ratio : n. （pl. ratios）1. 比，比率，比值；比例；系數。2. 【經濟學】復本位制中金銀的法定比價。vt. 1. 用比例方式表達；求出…的比值；使…成比例。2. 將（相片）按比例放大或縮小。
  1. Even under the condition that the filling pressure was up to 1. 5mpa, the onset temperature was only 237 ?. with the filling nitrogen of 0. 9 mpa, the maximal pressure ratio reaches 1. 21 and the operation frequency is 25 hz. the ratio of the harmonic wave of the engine was very little and the frequency jumping was not found in present experiments

    在充氣壓力為0 . 9mpa的條件下，該熱聲發動機最大壓比可達1 . 21 ，遠高於駐波型熱聲發動機，實驗結果和理論分析均表明系統的工作頻率為25hz左右，實驗裝置的諧波比例非常小，且也沒發現頻率跳變等現象。
  2. A new calculation method for optimizing diesel engine performance, called nonlinear regression - mess method, is put forward. in this paper, 25 groups of simulated values are calculated from the diesel engine working model, specific fuel consumption, peak pressure, rate of pressure rise, nox and peak temperature are fitted into explicit function about compression ratio and fuel injection advance angle

    本文利用柴油機工作過程模型，得出25組模擬計算數據，利用非線性回歸將油耗、最大爆發壓力、壓力升高率、 no _ x濃度及最高燃燒溫度擬合成壓縮比和噴油提前角的顯函數，並用網格法進行優化，用c語言編制了優化計算程序，得出最佳的壓縮比和噴油提前角，使其優化匹配。
  3. Moreover, it has been pointed out that the hydrogen engine used in ? cylinder injection with high pressure can increase volumetric efficiency and compression ratio, - therefore, the performance indexes in this engine, such as output power, thermal efficiency, range of thickness of mixture with normal operation and nox emission, can be improved, and it is possible for the engine to realize rapid combustion of thin mixture, so abnormal combustion, such as backfire, pre ? ignition, can be controlled effectively

    指出了採用內部混合氣形成方式且高壓噴射的氫發動機，有利於提高充氣效率和壓縮比，從而改善發動機的動力性和經濟性；有利於擴展發動機正常工作的濃度范圍；並且有利於實現稀薄混合氣快速燃燒，從而可以有效地抑制早燃、回火及爆燃等異常燃燒和no _ x排放量。試驗指出了發動機的點火正時、噴射正時及噴氫量對發動機的性能、異常燃燒、 no _ x排放量有很大影響。
  4. These variable geometry components include high pressure - compressor, high - pressure turbine, low - pressure turbine, inlet area ratio of mixer and main nozzle throat area. the results of calculation show that the adjusting of low - pressure turbine and mixer has a remarkable effect on the performance of engine and bypass ratio

    計算結果表明，低壓渦輪和混合器的調節對發動機的性能和涵道比的影響尤為顯著；在其它部件幾何結構不同時，單個部件幾何調節后，發動機性能的變化趨勢是不同的。
  5. In comparison with standing - wave heat engine, it has lower onset temperature and higher pressure ratio, which is of great significance for introducing a variety of energies of low quality into thermoacoustic engines, such as solar energy, waste vapor energy and so on

    該熱聲發動機比純駐波型熱聲發動機具有更低的起振溫度、更大的壓比及更高的熱聲轉換效率。
  6. To meet the needs for wider surge margin of the turbofan engine, a new model was developed to predict the characteristics of the fan / high pressure compressor and turbine in this thesis. several ways, including, variable inlet guide vanes of the fan, variable guide vanes of the high pressure compressor, the variable inlet area ratio of the mixer and the nozzle areas, were presented to enlarge the surge margin of the turbofan engine. meanwhile, a method of combined variable geometries for optimizing controls of inlet guide vanes of the fan, guide vanes and the first two stators of high pressure compressor, area ratio of mixer and noz zle areas was established

    為了滿足下一代作戰飛機對推進系統的性能和穩定性要求，本文建立了壓縮系統特性和渦輪特性的新模型，並分別採用改變渦扇發動機風扇進口導流葉片、壓氣機導流葉片和前兩級靜葉片、混合室進口處內、外涵面積比和尾噴管面積，研究了其對發動機性能和穩定性的影響，進而得出了渦扇發動機變幾何擴穩的方法，為發動機變幾何擴穩研究打下理論基礎。
  7. Four conclusions were obtained : 1 ) the ideal maximum performance of rbcc engine is basically determined by the match of rbcc " s basic operating parameters such as the ratios of primary / secondary mass flow rate, total pressure, total temperature and the ratio of overall oxidant / fuel mass flow rate, etc

    主要獲得如下結論： 1 ）基本工作參數的匹配，如引射比、總壓比、總溫比，決定了引射發動機最大可能獲得的性能。
  8. In this control system, some small modifications on low - pressure oil way are made by adding a dme blending device. under the system, the diesel engine can shift fast between pure diesel oil and diesel oil blended with dme conveniently. moreover, the control and adjustment of blending ratio of dme in some range can be achieved in this system

    該系統只需對yc6108q型柴油機的低壓油路加以改裝，在其中加上二甲醚的摻燒裝置，可以方便快速地在燃用純柴油和柴油-二甲醚混合燃料之間進行轉換，而且系統採用電控技術實現了二甲醚摻燒比例在一定范圍內的控制和調節。
  9. Epr engine pressure ratio

    發動機壓力比
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