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考慮熱力學(xué)效應(yīng)的空化模型修正及其適用性研究
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國家自然科學(xué)基金面上項目(51776087)、江蘇省重點研發(fā)計劃項目(BE2016166)、 江蘇省六大人才高峰高層次人才培養(yǎng)對象項目(HYGC-008)、江蘇省“333工程”科研項目(BRA2019039)和江蘇省青藍工程中青年學(xué)術(shù)帶頭人培養(yǎng)對象項目


Modification and Validation of Cavitation Model with Considering Thermodynamic Effects
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    摘要:

    為了研究熱力學(xué)效應(yīng)對不同溫度水和低溫流體空化影響,針對Zwart、Merkle和Singhal 3種典型空化模型,基于Antoine方程,考慮汽化潛熱引起的飽和蒸汽壓變化以及湍動能對當(dāng)?shù)仄瘔簭姷挠绊?,通過CFX前處理編輯分別對3種空化模型進行了修正,提出了全新的考慮熱力學(xué)效應(yīng)的空化模型。針對不同溫度水為介質(zhì)的NACA0015翼型,分別采用3種不同空化模型及修正后的空化模型進行了數(shù)值模擬。結(jié)果表明,修正后的Merkle模型更加接近實驗值?;谛拚蟮腗erkle模型,模擬了不同溫度液氮為介質(zhì)的HORD翼型,并與實驗結(jié)果進行了對比。研究發(fā)現(xiàn),考慮熱力學(xué)效應(yīng)時,空化區(qū)域產(chǎn)生溫度下降、對應(yīng)飽和壓力下降,致使空化強度減弱,空穴長度縮短,當(dāng)?shù)乜栈瘮?shù)均大于遠場空化數(shù)。相比溫度為77.64K的工況,83.06K工況下的熱力學(xué)敏感性更高,壓降更多,空化受抑制更加明顯。

    Abstract:

    During the growth and breakup of cavitation, thermodynamic effects will influence cavitation on water at different temperatures and cryogenic fluid. Combined Antoine equation and considered the change of saturated vapor pressure caused by latent heat of vaporization and impact of turbulent energy turbulence kinetic energy on local vaporization pressure, three kinds of cavitation models (Zwart, Merkle and Singhal) were modified. The hydrofoil NACA0015 at different water temperatures was numerically simulated by using three cavitation models and modified models. The conclusion showed that the simulated result of modified Merkle model was more consistent with experimental data. The HORD hydrofoil at different liquid nitrogen temperatures was numerically simulated based on the modified Merkle model. The results compared with experimental data showed that temperature and corresponding saturated vapor pressure were decreased in the cavity, leading to cavitation intensity decreased, the cavity length shortened and local cavitation number was over far field cavitation number. The liquid nitrogen temperature at 83.06K compared with it at 77.64K was more sensitive to thermodynamics, the pressure drop was larger and the cavitation intensity was weaker. The results can provide a new correction method of cavitation model for studying cavitation of water and cryogenic fluids at different temperatures. In addition, the modified cavitation model was of great significance for studying the thermodynamic effects in the cavitation process and it can be applied to cryogenic cavitation in engineering problems.

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張德勝,萬福來,許彬,王超超,施衛(wèi)東.考慮熱力學(xué)效應(yīng)的空化模型修正及其適用性研究[J].農(nóng)業(yè)機械學(xué)報,2019,50(2):138-146. ZHANG Desheng, WAN Fulai, XU Bin, WANG Chaochao, SHI Weidong. Modification and Validation of Cavitation Model with Considering Thermodynamic Effects[J]. Transactions of the Chinese Society for Agricultural Machinery,2019,50(2):138-146.

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  • 收稿日期:2018-08-23
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  • 在線發(fā)布日期: 2019-02-10
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