汽轮机原理习题解答.doc

汽轮机原理习题参考答案习题1(1)(2)(3)(4)(5)(6)(7)(8)损失已经计算，图略(9)图略(10)(11)(12)略。22习题2(1)高压缸：级号内功率Pi级流量D0级前温度级前压力级前比熵级前焓全级压差级后压力级后焓级理想焓降级的相对内效率有效焓降级实际出口焓值调节级18555905.6537166.4393403.744.2511.753304.299.540.74101911273.76104243329.97895815365886.1483.811.66.45373311.270.88310.7173286.6824.590.88640247921.796636953289.47336325608886.1471.110.76.4583289.320.8599.8413263.74525.5750.89086547222.783884443266.53611635992886.1457.99.876.45953265.810.8579.0133238.5427.270.89270184224.343979233241.46602146325886.1443.89.016.4633241.2060.8388.1723212.43328.7730.89308983925.696873943215.50912656551886.1428.98.176.4673215.140.7977.3733185.48629.6540.89751988726.615054733188.52494566855886.1413.57.386.47063187.9820.7656.6153157.0330.9520.89978449827.850129783160.1318777194886.1397.66.616.4763160.30.735.883127.93232.3680.90297210129.227400973131.07259986345852.93815.896.483131.0560.6265.2643100.6830.3760.88166871126.781568773104.27443196653852.9365.25.266.4843103.280.5994.6613071.35531.9250.87961171328.081603943075.198396106930852.9348.84.666.4893074.4870.5634.0973041.3333.1570.8821905329.250791423045.236209117203852.9331.84.16.49433044.490.5253.5753010.1434.350.88509738930.403095323014.086905高压缸总的有效焓降为：366.592 kj/kg，高压缸总的理想焓降为：428.53 kj/kg由调节级前熵s6.439kj/(kg*k)和第11级后压力3.575Mpa，得焓h2978.087kj/kg高压缸重热系数：=(428.53-(3403.74-2978.087)/ (3403.74-2978.087)=0.00676调节级的相对内效率：73.761/99.54=0.741高压缸效率：366.592/(3403.74-2978.087)=0.86125(2)汽轮机高压缸各级效率逐渐增加，直到第一次回热抽汽后降低至最小，后又逐渐增加。原因：由于叶片变大，所以叶高损失变小，所以效率提高，直到有回热抽汽后，损失变大，所以效率降低。(3)高压进汽压力损失：16.716.000.7Mpa再热器压力损失：3.5753.120.455Mpa中低连通管压力损失：0.7910.7690.022Mpa中压缸级号内功率Pi级流量D0级前温度级前压力级前比熵级前焓全级压差级后压力级后焓级理想焓降级的相对内效率有效焓降级实际出口焓值17818747.6533.63.127.3123531.440.3362.7843490.37541.0650.91676293637.646869983493.7931328052758515.32.187.4353500.0230.3141.8663445.22954.7940.69791744838.241688653461.78131138520758496.42.477.3213454.9060.3022.1683410.12144.7850.90352528640.464379953414.4416248831758476.42.167.3283414.1680.2811.8793367.57446.5940.90014647441.94142483372.22657559158758455.51.887.3333371.690.2571.6233323.93447.7560.91076428343.49445913328.19554169062724.9433.71.637.33623327.480.2361.3943278.22449.2560.91366990145.003724653282.47627579651724.9411.11.397.3433282.070.221.173229.6152.460.91362595847.928817773234.141182810276724.9386.91.177.34933233.650.2030.9673177.76955.8810.91323874251.032694163182.617306910666724.9361.10.977.3553182.2960.1790.7913124.87757.4190.92250845652.969513043129.326487中压缸总的有效焓降为：398.7236 kj/kg由第1级前熵7.312和第9级后压力0.791Mpa得出h3099.103 kj/kg中压缸的效率：398.7236/(3531.44-3099.103)=0.92225低压缸级号内功率Pi级流量D0级前温度级前压力级前比熵级前焓全级压差级后压力级后焓级理想焓降级的相对内效率有效焓降级实际出口焓值18610329.3331.40.7697.3663123.7080.2420.5273024.2599.4580.86758229686.2883037.4229197329.3287.20.5417.3773037.040.1910.352931.46105.580.79243701583.66552953.374538585294.3243.70.3727.39052952.60.140.2322847.434105.1660.8986459594.5072858.09349262275.4194.50.2327.413432858.0930.10.1322745.626112.4670.910542648102.4062755.68758297258.5140.80.1337.434242755.60.06080.07222624.28131.320.843055133110.712644.89613222246.591.80.07367.4652662.6830.05270.02092522.65140.0330.845514986118.42544.283711308246.563.40.02287.8652614.860.01680.0062463.047151.8130.830956506126.152488.711个低压缸总的有效焓降为：722.1265 kj/kg 由第1级前的熵7.366和第7级后压力0.006Mpa得出h2268.757 kj/kg低压缸的效率：722.1265/(3123.708-2268.757)=0.84464(4)dmu级的理想焓降ca速比相对内效率调节级0.741高压缸第一级0.85419134.175924.59221.76560.6050340.8864高压缸末级1.07704169.18134.35262.10680.6454660.8851中压缸第一级1.08966171.163441.065286.58330.5972550.916763中压缸末级1.32736208.501257.419338.87760.615270.92251低压缸第一级1.91978301.558399.4584460.676140.9464低压缸末级2.64287415.141191.813619.37550.6702570.861沿蒸汽膨胀流程，级焓降逐渐增大。原因：沿蒸汽膨胀流程，轮周速度增大，为了保证较高的效率，各级均应在最佳速比附近工作，则相应的理想焓降要增大。 (5)(6)Pe发电机功率Pel发电机效率汽耗率给水焓热耗率汽轮机总理想焓降凝结水的焓总的吸收热量循环热效率汽轮机总实际焓降内效率热效率3085723000000.9722204223.034011146.9648122.0191712.941137.773779.3130.453241487.440.868360.38264习题3（1）设平衡活塞压力为P1，平衡活塞汽封漏气量为DG1 假设调节级和平衡活塞汽封均未达临界 查得，假设成立C时，查得（2）D=495mm的轴封最后一片达临界查得 D=432mm的轴封未达临界查得 （3）大气环境：最后一个轴封未达临界（4）方法如（1） 解得 （5）（6）要外泄，则 作业4（1）（2）假设调节级为临界工况时， 算开阀点4后的流量： 每个汽门流量为： 阀点5： 每个汽门流量为： （3） 由0点等熵交P2于点2t，得h2t=3288.99kJ/kg阀点1： 由0