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Apakah pam emparan? Bagaimana ia berfungsi?

Dalam pam emparan, sebagai dengan semua turbomachines, terdapat elemen utama yang dikenali sebagai pendesak, berputar dengan halaju sudut sekitar paksi yang tetap. Bentuk paling sederhana pendesak emparan diperolehi dengan sayap (jejari) di tengah-tengah antara dua cakera selari. Di samping itu, salah satu cakera tersebutpenebalan sekitar paksi dan bersambung dengan batu. Seperti yang dinyatakan dalam Rajah berikut, zarah cecair di dalam pendesak putar sekitar paksi putaran dengan kelajuan U = rωwith roda, manakala di bahagian lain, ia bergerak mengikut roda dengan W-kelajuan dan daun. U mendapat nama halaju relatif alam sekitar halaju, W.

 

Apabila pendesak berisi cecair mula berputar sekeliling paksi, ia mula muncul dari permukaan cecair B di bawah pengaruh kuasa-kuasa centrifugal. Oleh itu, cecair yang diserap dari permukaan E dicetak dari lahir di permukaan

 

Aliran yang dilihat oleh seorang pemerhati yang berputar dengan roda akan berbeza daripada aliran pemerhati dalam persekitaran tak bergerak. Halaju zarah yang bergerak dalam aliran, menurut seorang pemerhati pegun dalam persekitaran tidak mempunyai kelajuan mutlak, kelajuan kelajuan relatif yang roda melihat pada titik di mana pemerhati berputar dengan roda.

 

Kelajuan yang mutlak adalah jumlah vectorial C, W, dan kelajuan anda. Dengan keamatan dan hala tuju W dan kelajuan anda, ia membentuk kelebihan yang segi empat tepat. Ambang ini mewakili halaju mutlak segi empat tepat di diagonal. Tepi segi empat tepat yang menunjukkan halaju relatif W dan kelajuan ambien anda, bergantung kepada keamatan dan hala-tuju keganasan. Oleh itu, kelajuan tiga ini membentuk segi tiga. Dalam kiraan, jumlah yang tidak terhingga sayap sangat nipis akan bertindak pemikiran. Dalam kes ini, ianya boleh diterima benang aliran dipantau sepenuhnya dan suapan adalah satu dimensi. Jika input kesan, permulaan sayap adalah tangent kepada halaju relatif input. Dengan ungkapan lain, kadar W1, yang membuat sudut β1 dengan pengambilan bilik pam, berada dalam arah yang sama sebagai profil sayap. Begitu juga, kelajuan W2, yang membuat sudut β2 dengan hujung sayap jalan keluar, adalah dalam arah yang sama. Arah input bergantung pada arah elemensayap yang pertama dalam entri ini dan orientasi kelajuan kemasukan apabila entri ini diminta dilaksanakan tanpa gangguan dan seterusnya mencegah kerugian. Dalam pam, bilah berakhir di bawah sudut β2 kelajuan relatif W2.

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