The article analyzes the main options for design solutions of separation devices of promising launch vehicles and payloads without using pyrotechnic elements,such as the“Clamp Band”type,“ball”and“petal”types,as ...The article analyzes the main options for design solutions of separation devices of promising launch vehicles and payloads without using pyrotechnic elements,such as the“Clamp Band”type,“ball”and“petal”types,as well as the bandage-based separation device.Parametric redundancy has been performed to achieve the required level of the reliability,providing the necessary coefficient of parametricmargin.Engineering Critical Assessment of structural elements of the proposed separation devices by using the scorecardmethod is analyzed and considered.The reliability requirements are considered,whichmust be confirmed during complex experimental processing,including laboratory debugging,control developing,control sampling,control finishing and manufacturing tests of individual large-sized elements and subsystems included in the proposed separation devices,as well as recommendations for ensuring the reliability of their operation at the design development stage.展开更多
The current paper presents experimental and computational results to assess the effectiveness of non-axisymmetric endwall contouring in a compressor linear cascade. The endwaU was designed by an endwall design optimi-...The current paper presents experimental and computational results to assess the effectiveness of non-axisymmetric endwall contouring in a compressor linear cascade. The endwaU was designed by an endwall design optimi- zation platform at 0° incidence （design condition）. The optimization method is based on a genetic algorithm. The design objective was to minimize the total pressure losses. The experiments were carried out in a compressor cascade at a low-speed test facility with a Mach number of 0.15. Four nominal inlet flow angles were chosen to test the performance of non-axisymmetric Contoured Endwall （CEW）. A five-hole pressure probe with a head diameter of 2 mm was used to traverse the downstream flow fields of the flat-endwall （FEW） and CEW cascades. Both the measured and predicted results indicated that the implementation of CEW results in smaller comer stall, and reduction of total pressure losses. The CEW gets 15.6% total pressure loss coefficient reduction at design condition, and 22.6% at off-design condition （＋7° incidence）. And the mechanism of the improvement of CEW based on both measured and calculated results is that the adverse pressure gradient （APG） has been reduced through the groove configuration near the leading edge （LE） of the suction surface （SS）.展开更多
基金Financial support was provided by the Ministry of Science and Higher Education of the Russian Federation(project FSFF-2023-0007).
文摘The article analyzes the main options for design solutions of separation devices of promising launch vehicles and payloads without using pyrotechnic elements,such as the“Clamp Band”type,“ball”and“petal”types,as well as the bandage-based separation device.Parametric redundancy has been performed to achieve the required level of the reliability,providing the necessary coefficient of parametricmargin.Engineering Critical Assessment of structural elements of the proposed separation devices by using the scorecardmethod is analyzed and considered.The reliability requirements are considered,whichmust be confirmed during complex experimental processing,including laboratory debugging,control developing,control sampling,control finishing and manufacturing tests of individual large-sized elements and subsystems included in the proposed separation devices,as well as recommendations for ensuring the reliability of their operation at the design development stage.
基金supported by National Natural Science Foundation of China(51236001)National Basic Research Program of China(2012CB720201)Beijing Natural Science Foundation(No.3151002)
文摘The current paper presents experimental and computational results to assess the effectiveness of non-axisymmetric endwall contouring in a compressor linear cascade. The endwaU was designed by an endwall design optimi- zation platform at 0° incidence （design condition）. The optimization method is based on a genetic algorithm. The design objective was to minimize the total pressure losses. The experiments were carried out in a compressor cascade at a low-speed test facility with a Mach number of 0.15. Four nominal inlet flow angles were chosen to test the performance of non-axisymmetric Contoured Endwall （CEW）. A five-hole pressure probe with a head diameter of 2 mm was used to traverse the downstream flow fields of the flat-endwall （FEW） and CEW cascades. Both the measured and predicted results indicated that the implementation of CEW results in smaller comer stall, and reduction of total pressure losses. The CEW gets 15.6% total pressure loss coefficient reduction at design condition, and 22.6% at off-design condition （＋7° incidence）. And the mechanism of the improvement of CEW based on both measured and calculated results is that the adverse pressure gradient （APG） has been reduced through the groove configuration near the leading edge （LE） of the suction surface （SS）.
