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利用气固两相流流体力学及经验公式,获得气力输送气-固喷射器结构设计公式。研究结构以及各参数对气固喷射器性能的影响规律。结果表明,在喷射系数小于极限喷射系数(极限喷射系数为7.4)时,降低压缩压力会引起喷射系数的增加,但增加幅度较为平缓。在同一喷射系数时,最佳截面积比(f3/fp*)y=14对应的喷射压缩压力值最大。在喷射系数u=7时,(f_3/f_(p*))y=14的最大压力降最小,Δp/p_E=0.037;在u=0时,(f_3/f_(p*))y=14的最大压力降最大,Δp/pE=0.065。当喉嘴距S<21mm时,随着S增加,固气比m呈上升趋势。反之,则出现噎塞现象。混合管段尺寸L_m/d_m值在9时,能取得较高的固气比m。
By using the gas-solid two-phase flow mechanics and empirical formula, the structure design formula of pneumatic conveying gas-solid ejector is obtained. The influence of various parameters on the performance of gas-solid ejectors was studied. The results show that when the injection coefficient is less than the limit injection coefficient (the limit injection coefficient is 7.4), reducing the compression pressure will cause the injection coefficient to increase, but the increase rate will be more gentle. In the same injection coefficient, the best cross-sectional area ratio (f3 / fp *) y = 14 corresponds to the maximum jet compression pressure value. The maximum pressure drop of (f_3 / f_ (p *)) y = 14 is the smallest at the injection coefficient u = 7, Δp / p_E is equal to 0.037; when u = 0, (f_3 / f_ Maximum pressure drop maximum, Δp / pE = 0.065. When the throat distance S <21mm, with the increase of S, the solid-gas ratio m is on the rise. Conversely, there congestion phenomenon. Mixing pipe size L_m / d_m value at 9 o’clock, can get a higher solid-gas ratio m.