Then , four different computation methods are applied to compute the hydrodynamic performance of the rotor , which are single - disk single - tube method ( sdst ) , double - disk single - tube method ( ddst ) , multi - tube method ( mtt ) that are based on momentum theorem and vortex method ( vtth ) that is based on potential eddy theory 然后,采用基于動(dòng)量定理的單盤(pán)面?單流管方法( sdst ) 、雙盤(pán)面?單流管( ddst )方法、多流管( mtt )方法以及基于勢(shì)渦理論的渦方法( vtth )計(jì)算直葉擺線式水輪機(jī)的水動(dòng)力性能。
At first an analysis of the basic principles of the vertical - axis variable - pitch turbine is given including two methods to calculate the induced velocity . one is the three different streamtube - methods which are single - disk single - streamtube ( sdst ) , double - disk single - streamtube ( ddst ) and multi - streamtube ( mtt ) method based on the momentum theory , the other is the vortex method ( vtth ) based on the potential eddy theory 一是根據(jù)動(dòng)量定理的流管模型得到的求解誘導(dǎo)速度的單盤(pán)面?單流管方法( sdst ) 、雙盤(pán)面?單流管( ddst )方法、多流管( mtt )方法;二是根據(jù)勢(shì)渦理論得到的求解誘導(dǎo)速度的的渦方法( vtth ) 。