外文翻譯--優(yōu)化活塞行動(dòng)改進(jìn)的發(fā)動(dòng)機(jī)性能-其他專業(yè)-資料下載頁
2025-01-19 09:55本頁面
【導(dǎo)讀】基本通順，總體譯文質(zhì)量尚可，但少數(shù)專業(yè)術(shù)語翻譯不夠準(zhǔn)確，摘要利用有限時(shí)間熱力學(xué)方法發(fā)現(xiàn)奧托循環(huán)的優(yōu)先時(shí)間路徑及摩擦和熱滲漏。工作的最大化定義每個(gè)周期;系統(tǒng)被控制在一個(gè)固定的空間內(nèi)，因此便能獲得最大動(dòng)力。常規(guī)熱力學(xué)相關(guān)原則上橫跨主題的整個(gè)間距，從最抽象的水平到廣泛的應(yīng)用。迄今為止，有限時(shí)間熱力學(xué)的工作集中于較為理想化的模型(2-7)和存在性定理，這項(xiàng)工作是希望作為一個(gè)步驟連接在實(shí)用的有限時(shí)間熱力學(xué)方面涌。實(shí)際的發(fā)動(dòng)機(jī)中是以二主要損失的形式存在。我們的模型是基于標(biāo)準(zhǔn)的四沖程奧托循環(huán)。放松這些限制中的任一個(gè)可能進(jìn)一步改善。成正比，對(duì)應(yīng)于潤滑良好的金屬表面；因此，摩擦損失也直接與速度正方形有關(guān)。損失在所有沖程中是不同樣的。于摩擦損失與速度的二次方成比例，最宜的運(yùn)動(dòng)取決于速度常數(shù)。允許的最大效率加速并且減速。由于摩擦損失在進(jìn)氣沖程較高，與其他兩個(gè)相比，這個(gè)最。選出，氣體冷卻率和熱泄漏相對(duì)于摩擦損失減少。
【正文】 ximum rates. In this way, the system spends as much time as possible moving along its best or turnpike path. RESULTS Parameters for the putations were taken from ref. 10 or, in the case of the friction coefficient, adjusted to give frictional losses of the magnitude cited in ref. 10. Those parameters are given in Table 1. The results of the calculations of some typical cases are given in Table 2, where they are pared with the conventional Otto cycle engine having the same pression ratio but a standard nearsinusoidal motion. The effectiveness ε(the ratio of the work done to the reversible work, also called the secondlaw efficiency) is slightly higher for the optimized engine whose pistonacceleration is limited to 5 x 103 m/sec2 ， the maximum of the conventional engine of the first row. If the piston is allowed to have 4 times the acceleration of the conventional engine, the effectiveness increases 9%。 if the acceleration is unconstrained, the improvement in effectiveness goes up to 11%. These values are typical, not the most favorable. If the total losses of the conventional engine are held approximately constant but shifted to correspond to about 80% larger heat loss and about 60% smaller friction loss, the gain in effectiveness goes up, reaching more than 17% above the effectiveness of the corresponding conventional engine. The principal source of the improvement in use of energy in this analysis is in the reduction of heat losses when the working fluid is near its maximum temperature. This is why the improvement is greater for engines with large heat leaks and low friction than for engines with relatively better insulation but higher friction. 13 Finally, it is instructive to examine the path of the piston in time, for the optimized engine and for its conventional counterpart. The position of the piston as a function of time is shown for these two cases in Fig. 2. 14 In closing, emphasize the unconventional approach to optimizing a thermodynamic system illustrated by this work. Instead of controlling heat rates, heat capacities, conductances, friction coefficients, reservoir temperatures, or other usual parameters of thermodynamic engines, we have controlled the time path of the engine volume. References: 1, double, such as editorinchief Wang. Automotive electronic control systems and maintenance of the principle. Beijing: Beijing Institute of Technology Press. 1998 2, YiQiwen, editorinchief. Shanghai Passat B5 sedans manual fault diagnosis. Liaoning: Liaoning Science and Technology Press. 2021 3,yangyi, editor. Automotive electronic control technology. Beijing: Mechanical Industry Press. 1999
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