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鈍化孔板下游流場畸變在線識別與測量值修正
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國家自然科學(xué)基金資助項目（60974118）


Online Identification and Correction of Orifice Inlet Edge Bluntness Based on Downstream Flow Field Distortion
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    摘要:

    針對標(biāo)準(zhǔn)孔板鈍化問題，提出了在線識別算法,，并給出具體方案,。首先利用Fluent流場仿真軟件對孔板正常工況和鈍化工況進(jìn)行建模與仿真計算，與國家標(biāo)準(zhǔn)對比驗證了仿真的正確性,。為實現(xiàn)識別算法,，在孔板法蘭取壓點P1、P2后方,，再增設(shè)一取壓點P3,，計算3個取壓點中兩組差壓的比值，得到差壓比值因子η,，因子η反映了鈍化的孔板下游流場相對于正常工況時的畸變程度,，即η反映了鈍化程度。通過分析仿真計算結(jié)果確定了P3取壓點的最佳選取位置,，并進(jìn)一步得出η與鈍化程度的計算式,。通過計算式，可以實現(xiàn)鈍化的在線識別與流量測量值修正?，F(xiàn)場實流實驗驗證了識別算法的有效性,，相對于國家標(biāo)準(zhǔn)，算法的誤差在±1.0%以內(nèi),。

    Abstract:

    Online identification of orifice bluntness was put forward, and specific solutions was given. Orifice discharge coefficient of CFD simulation on normal condition and bluntness conditions were compared with GB/T 21446—2008 to verify the validity of the simulation. To achieve the identification, in the rear of the flange pressure points (P1, P2) another pressure point P3 was installed and the differential pressure ratio factor (η) was calculated. The factor reflected the degree of distortion of orifice plate flow field relative to the normal condition, which was the ratio factor indirectly reflected the degree of bluntness. The best position of pressure points P3 was determined by the analysis of simulation results, and the experience formula about the ratio factor with bluntness was further concluded. Through the formula, online identification of bluntness could be realized. The effectiveness of the identification algorithm was verified through real flow experiments. The error of calculated value was within ±1.0% for sharpness correction coefficient (bk), which proved that the algorithm was practicable in engineering. 

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李紅文,張濤.鈍化孔板下游流場畸變在線識別與測量值修正[J].農(nóng)業(yè)機械學(xué)報,2014,45(6):317-323. Li Hongwen, Zhang Tao. Online Identification and Correction of Orifice Inlet Edge Bluntness Based on Downstream Flow Field Distortion[J]. Transactions of the Chinese Society for Agricultural Machinery,2014,45(6):317-323.

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  • 收稿日期:2014-01-16
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  • 在線發(fā)布日期: 2014-06-10
  • 出版日期: 2014-06-10
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