The geometry of a compressor leading edge has an important effect on the aerodynamic performance at off-designed incidence angle. current geometric design methods are usually developed based flow characteristics designed However, few research focuses quantitative rules angle in cascade. This situation restricts further optimization and development method. In this paper, starting from potential ...

Abstract This paper aims to interpret the coupling modal properties of cyclic blades under impact–friction interactions and their evolution mechanism versus operating points. Therefore, a analytical model is developed based on Lagrange method assumed mode (AMM), after considering centrifugal stiffening, spin softening, stagger angle, twist angle. Then mixed analysis (MMAM) for this extended by ...

The title co-crystal, C8H3Br2NO2·0.5C14H10, was self-assembled from a 2:1 mixture of the components in slowly evaporating di-chloro-methane. The mol-ecules adopt a sheet structure parallel to (1-12) in which carb-oxy hydrogen-bonded dimers and anthracene mol-ecules stagger in both dimensions. Within the sheets, six individual cyano acid mol-ecules surround each anthracene mol-ecule. Cyano acid ...

The low speed perfommlce of low stagger compressor bl&i.ng at three pitcbdchord ratlios-by-Two stages of low qeed, low stagger blading were tested &t man diameter pitc$/chord ratios of 0.43, 0.66 and C.34. Contmry to the indications of some earlier published work, t'nere was no si@ficant Pall-off in elYiciency at the lowest, pitching, and the trend of the performance was in line with that predi...

This study explores the numerical optimization of water turbine runner profile performance using a surface vorticity model algorithm. The is designed on laboratory scale and operates at net head 0.09 m, 400 rpm, flow rate 0.003 m3/s. initial design was optimized to minimize losses in hydrofoil. algorithm coded MATLAB software obtain optimal stagger angle that will be used design. Furthermore, v...

An algorithm of solving phase ambiguity of multi-baseline direction finding system based on sparse uniform circular array is proposed in this paper. This sparse uniform circular array whose inter-element spacing is larger than half-wavelength distance suffers from cyclic phase ambiguities, which may cause estimation errors. In order to solve the above phase ambiguities, the corresponding virtua...

BACKGROUND Obstetric anal sphincter injuries (OASIs) are the leading cause of anal incontinence in women. Episiotomies with a postdelivery suture angle of less than 30° to the midline are more likely to injure the anal sphincter directly, while those with a suture angle of more than 60° are associated with increased incidence of OASIs, as they do not relieve the pressure on the perineum. A safe...