101國營機械專b 幾個問題 - 考試
By Damian
at 2013-11-08T21:27
at 2013-11-08T21:27
Table of Contents
1.第三題第(三)小題
我是用delta S=Cp ln(t2/t1)-R ln(p2/p1) 但這公式只適用理想氣體嗎?
解得熵變化為1.011 再代入s2-s1=1.011 得S2=1.307(KJ/kg-k)
2.第六題
(一)comp/turbine功率比=200/400=0.5
(二)效率代公式得 40.12%
(三)質量流率為5kg/s==>這個不確定
我是用Wnet/dt=(效率)*Qin/dt ,Qin/dt=m/dt *Qin
3.第九題(這題太簡單感覺怪怪的)
(一)流量Q=8.26(m^3/s)
(二)Wact=125818(kw)
(一)是用柏努利 其中p1=p2=0 v1=v2=0(v2為水輪機出口速度)
加上wp/dt=m/dt *g* ht
4.第十題
算到這頭開始昏了
(一)用雷諾數相似 V氣球=1.35(m/s)
(二)F氣球=1.62(N)
想說對個答案 如果不一樣 煩請指教
--
我是用delta S=Cp ln(t2/t1)-R ln(p2/p1) 但這公式只適用理想氣體嗎?
解得熵變化為1.011 再代入s2-s1=1.011 得S2=1.307(KJ/kg-k)
2.第六題
(一)comp/turbine功率比=200/400=0.5
(二)效率代公式得 40.12%
(三)質量流率為5kg/s==>這個不確定
我是用Wnet/dt=(效率)*Qin/dt ,Qin/dt=m/dt *Qin
3.第九題(這題太簡單感覺怪怪的)
(一)流量Q=8.26(m^3/s)
(二)Wact=125818(kw)
(一)是用柏努利 其中p1=p2=0 v1=v2=0(v2為水輪機出口速度)
加上wp/dt=m/dt *g* ht
4.第十題
算到這頭開始昏了
(一)用雷諾數相似 V氣球=1.35(m/s)
(二)F氣球=1.62(N)
想說對個答案 如果不一樣 煩請指教
--
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