��mЧ�ʵ�Ӌ��

��r�g��2008-05-20 10:20 ��Դ�� : ��x��15084

Ҫ��늳��m��ĳ��mЧ��轨��΢�ַ��̡��늳��m��ĳ��mЧ��c�ۉm��|,��늈��,��ٶ�,��w�ԓ��m��Y��P��Ҫ��؏��Փ��ƌ��mЧ�ʷ��ʽ��y��,��ƌ��^��¼��O��

��늳��m��M��Ѓ��υ^(q��)��,��m�O��Č��߅��Ӻ͎׺�ռ��^(q��)��

�ډm��\��Ŀ��,��ϵĝ�ȷֲ��Ǿ��,��

��߅��Ӊm��д�ֱ�ڱ��ķ��ٶ�ω��

�ܺ��L,��ֲ��,��ΓP�m��ص�Ӱ푡�

�D1 �o늳��m��mЧ�ʷ��ģ�͈D

��΢�ַ��Ҫ��ģ��D1��ʾ,��O��w�ͷۉm��ˮƽ��ٞ�υ��m/s��,��m��ĳһ��Ϛ��w��m��Ȟ�y��g/m³��\�ӷ��ÿ��λ�L�ȼ��m��e��a��m²/m��,��\�ӷ��ϳ��m��ęM��e��F��m²��,��늈��L�Ȟ�l��m��m��M�Ȟ��\�ӷ��ϳ��m��ęM��e��F��m²��,��늈��L�Ȟ�죨m��,��m��M�ٶȞ�ω��m/s��

��dτ�r�g��,��dχ��g��ķۉm��

dm=α��dχ��ωdτy=-F��dx��dy (1)

��dχ=υdτ��ʽ,��t

��ʽ��߅�M�зe�֣�

(2)

ʽ��y1——��m��M��̎��m��,��g/m³,��

y2——��m��̎��m��ȣ�g/m³,��

��Fυ=L,��αι=A��ʽ��t

ʽ��L——��m��̎��L��,��m³/s,��

A——��m�O��ļ��m��e��m²,��

�t��mЧ�ʞ�

(3)

��1 ��ͬ��Aω/L��ֵ�µĳ��mЧ��

Aω/L	0	1	2	2.3	3	3.91	4.61	6.91
η��%��	0	63.2	86.5	90	95	98	99	99.9

��ʽ��3��һϵ�м��O��ǰ��µó��,��͌��H��r��ȫ��o�҂��ṩ�˷��,��Ӌ�ͱ��^늳��m��Ч�ʵĻ��A,��ԓʽ��Կ��ڳ��mЧ��һ��r��,��m��ߴ�͉m��M�ٶȳɷ��,��̎��L��,��ڳ��m��ߴ�һ��r�£��mЧ�ʺ͚��ٶȳɷ��,��

����D�d��ǳ��ڂ��f��Ϣ֮Ŀ��,��Ё�Դ��ע�e�`��ַ��ĺϷ��棬Ո��߳֙��C��c��W(li��n)ϵ,��҂��r��,��h��x�x,��