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ʽ£¨6£©¼´Îª´«Í³µÄÒº¶¯Á¦¼ÆË㹫ʽ[12]¡£ÓÉÒÔÉÏ·ÖÎö¿ÉÖªÔÚ´«Í³µÄÒº¶¯Á¦¼ÆË㹫ʽÖУ¬¼ÙÉè¿ØÖÆÌå¹Ì¶¨ÇÒΪ¶¨³£Á÷¶¯£¬ºöÂÔÁË¿ØÖÆÌåÄÚµÄÁ÷Ì嶯Á¿¶Ôʱ¼äµÄ±ä»¯ÂÊ£¬Õâ±Ø½«µ¼ÖÂÆä׼ȷÐԵĽµµÍ¡£
1¡¢Eq.(6) is the traditional method to calculate fluid force[12].From the above analysis we can know in the traditional calculation formula of flow force supposed control body is stationary and fluid flow is steady flow, which the rate of change of the fluid momentum in the control body with respect to time is neglected,which will lead to inaccurate calculation results.

2¡¢Eq.(6) is the traditional way to calculate fluid force. [12] From the above we can know in the traditional formula, there is a assumption that control volume is stationary and has a steady flow, which neglects the change rate of flow momentum and time, which will certainly results in low accuracy.

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