【摘要】：為了提高液力透平工作時(shí)的穩(wěn)定性,降低機(jī)組的振動(dòng),在液力透平葉輪進(jìn)口前添加不同數(shù)量的導(dǎo)葉,采用SSTk-ω湍流模型,利用FLUENT軟件通過在各過流部件內(nèi)設(shè)置監(jiān)測點(diǎn)計(jì)算在不同導(dǎo)葉數(shù)下液力透平內(nèi)的壓力和壓力脈動(dòng)情況,然后通過快速傅里葉變換將壓力脈動(dòng)的計(jì)算結(jié)果進(jìn)行處理,分析液力透平各過流部件內(nèi)壓力脈動(dòng)的時(shí)域和頻域分布,最后總結(jié)導(dǎo)葉數(shù)對(duì)液力透平機(jī)組工作時(shí)穩(wěn)定性的影響規(guī)律。研究表明:當(dāng)導(dǎo)葉數(shù)等于9時(shí)蝸殼內(nèi)的壓力脈動(dòng)主頻幅值最小;隨著導(dǎo)葉數(shù)的增加,葉輪內(nèi)的最大壓力脈動(dòng)幅值逐漸減小,而導(dǎo)葉數(shù)對(duì)尾水管內(nèi)壓力脈動(dòng)幅值的影響較小;要提高液力透平機(jī)組的穩(wěn)定性需降低液力透平內(nèi)的壓力脈動(dòng)幅值,而通過葉輪進(jìn)口前添加導(dǎo)葉的方法可以很好地降低液力透平內(nèi)的壓力脈動(dòng)幅值,但導(dǎo)葉數(shù)不能太少也不能過多。
[Abstract]:In order to improve the stability of the hydraulic turbine and reduce the vibration of the unit, different numbers of guide vane were added before the inlet of the hydraulic turbine impeller, and the SSTk- 蠅 turbulence model was used. The pressure and pressure pulsation in hydraulic turbine with different guide vane numbers are calculated by setting monitoring points in various flow passing parts by using FLUENT software, and then the calculation results of pressure fluctuation are processed by fast Fourier transform. The time-domain and frequency-domain distributions of pressure pulsation in hydraulic turbine components are analyzed. Finally, the influence of guide vane number on the stability of hydraulic turbine unit is summarized. The results show that when the number of guide vane is equal to 9, the main frequency amplitude of pressure pulsation is minimum, and the maximum pressure fluctuation amplitude in impeller decreases gradually with the increase of guide vane number, but the influence of guide vane number on the amplitude of pressure pulsation in draft tube is small. In order to improve the stability of hydraulic turbine set, the amplitude of pressure pulsation in hydraulic turbine should be reduced, and the amplitude of pressure fluctuation in hydraulic turbine can be reduced by adding guide vane before the inlet of impeller. But the number of guide vane should not be too small or too much.
【作者單位】： 西華大學(xué)能源與動(dòng)力工程學(xué)院流體及動(dòng)力機(jī)械教育部重點(diǎn)實(shí)驗(yàn)室;蘭州理工大學(xué)能源與動(dòng)力工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51279172) 西華大學(xué)重點(diǎn)科研基金資助項(xiàng)目(Z1510417)
【分類號(hào)】：TK05

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