With special mechanical pedal pressurized structure , its maximal pressure can reach 400kgs , and its intensity can handle with any conditions 經(jīng)過特殊的機(jī)械踏板加壓機(jī)構(gòu),最大壓力可達(dá)400kgs ,其強(qiáng)度足以應(yīng)付任何情況。
With the filling nitrogen of 0 . 9 mpa , the maximal pressure ratio reaches 1 . 21 and the operation frequency is 25 hz , which is a rather good result in this field 以氮?dú)鉃楣べ|(zhì),在充氣壓力為0 . 9mpa的條件下,該熱聲發(fā)動機(jī)最大壓比達(dá)1 . 21 ,工作頻率為25hz ,這是當(dāng)前國際上處于前列的實驗結(jié)果。
We can get many physical parameters through indicator diagram acquired in the experiment . such as indicator work , mean indicated pressure , maximal pressure and corresponding crank angle , maximal rate of pressure rise and corresponding crank angle and mass fraction burned , heat release rate , etc . these physical parameters can analyze and show primary in - cylinder combustion process in engine 通過實測的示功圖,經(jīng)過計算整理可以獲得諸如指示功、平均指示壓力、最高燃燒壓力及其對應(yīng)曲軸轉(zhuǎn)角、最高壓力升高率及其對應(yīng)曲軸轉(zhuǎn)角、已燃質(zhì)量分?jǐn)?shù)、燃燒放熱率等物理量,可供進(jìn)一步分析和揭示發(fā)動機(jī)缸內(nèi)燃燒過程。
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(fā)動機(jī)最大壓比可達(dá)1 . 21 ,遠(yuǎn)高于駐波型熱聲發(fā)動機(jī),實驗結(jié)果和理論分析均表明系統(tǒng)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(fā)現(xiàn)頻率跳變等現(xiàn)象。