Retaining nplhaib nrog conical cross-section

Lub conical cross-section retaining nplhaib txo qis symmetrically los ntawm qhov chaw mus rau qhov kawg dawb, thiab nyob twj ywm ncig thaum lub sij hawm contraction los yog expansion nyob rau hauv lub qub ntau yam ntawm kev siv. Qhov no ua kom muaj kev sib cuag nrog cov zawj raws tag nrho cov ncig ntawm lub nplhaib. Cov nplhaib no tuaj yeem ntsia tau axially (kab rov tav raws qhov chaw nruab nrab ntawm lub axis) lossis radially (tawm sab nraud raws lub vojvoog ntawm lub voj voog). Raws li qhov loj ntawm lub nplhaib uas cuam tshuam, ib qho ntawm ob txoj hauv qab no tuaj yeem siv rau kev tsim khoom:
Rau cov nplhaib me me: Siv cov pwm thiab nias los ntawm cov hlau los yog tooj liab coils ntawm xovxwm
Rau cov rings loj: cov hlau sib sau, qhov twg cov xov hlau raug mob rau hauv cov duab ntawm lub nplhaib.