A research concerning the coupling conditions of gas leakage through suction valves and capacity regulation is performed in an industrial reciprocating compressor.Both internal flow and thermodynamic characteristic ar...A research concerning the coupling conditions of gas leakage through suction valves and capacity regulation is performed in an industrial reciprocating compressor.Both internal flow and thermodynamic characteristic are discussed in detail.The results show that the capacity of compressor can be regulated steplessly by controlling suction valve closure moment.And then the quantitative relationship between the capacity load and the closing angle of suction valve is revealed.The capacity load and valve leakage rate show obvious different features in P-V diagrams,which makes it easier to define appropriate features for detecting cracked or broken reciprocating compressor valves under varying load conditions.A set of curves of compression work and discharge gas mass are obtained and a method for rating thermal performance of a compressor is presented using these curves.展开更多
The step load response of reciprocating engines is one of the key characteristics when considering its application in medium to large scale stationary power generation especially with islanded generation. This paper d...The step load response of reciprocating engines is one of the key characteristics when considering its application in medium to large scale stationary power generation especially with islanded generation. This paper discusses the impacts of power frequency deviation on the generators and electrical equipment in the network and presents the relationship between step load capabilities and generator operating parameters. For a power plant consisting of a number of generators both step load and power output requirements must be satisfied. An analysis method is proposed to facilitate the development of an operation strategy which can meet both step load and power demand requirements in the full load range.? Typical reciprocating engine step load curves are used to demonstrate the analysis method and the results are further optimised for lower operational cost. This analysis method provides a general approach to operation strategy of large reciprocating engines used in islanded power generation.展开更多
Medium shear span ratio reinforced columns are prone to complex failure under seismic action.This paper compares the seismic performance of normal concrete columns and UHPC columns by introducing ultra-high-performanc...Medium shear span ratio reinforced columns are prone to complex failure under seismic action.This paper compares the seismic performance of normal concrete columns and UHPC columns by introducing ultra-high-performance concrete(UHPC).The shear span ratio(2.4-4.4)and axial compression ratio(0.10,0.36)were used as variables,and the bearing capacity,ductility and failure mode were analyzed through low-cycle reciprocating loading studys.The results showed that UHPC significantly improved the bearing capacity,stiffness and energy dissipation capacity of the column,and suppressed the crushing and spalling of concrete.When the shear span ratio is 2.4 and the axial compression ratio is 0.36,the failure mode of UHPC columns was changed from shear failure to flexural shear failure.Thus this study can become a reference for the seismic design of UHPC columns.展开更多
基金the National Natural Science Foundation of China(No.52101343)State Key Laboratory of Compressor Technology(An Hui Laboratory of Compressor Technology)(No.SKL-YSJ201808/SKL-YSJ201911)。
文摘A research concerning the coupling conditions of gas leakage through suction valves and capacity regulation is performed in an industrial reciprocating compressor.Both internal flow and thermodynamic characteristic are discussed in detail.The results show that the capacity of compressor can be regulated steplessly by controlling suction valve closure moment.And then the quantitative relationship between the capacity load and the closing angle of suction valve is revealed.The capacity load and valve leakage rate show obvious different features in P-V diagrams,which makes it easier to define appropriate features for detecting cracked or broken reciprocating compressor valves under varying load conditions.A set of curves of compression work and discharge gas mass are obtained and a method for rating thermal performance of a compressor is presented using these curves.
文摘The step load response of reciprocating engines is one of the key characteristics when considering its application in medium to large scale stationary power generation especially with islanded generation. This paper discusses the impacts of power frequency deviation on the generators and electrical equipment in the network and presents the relationship between step load capabilities and generator operating parameters. For a power plant consisting of a number of generators both step load and power output requirements must be satisfied. An analysis method is proposed to facilitate the development of an operation strategy which can meet both step load and power demand requirements in the full load range.? Typical reciprocating engine step load curves are used to demonstrate the analysis method and the results are further optimised for lower operational cost. This analysis method provides a general approach to operation strategy of large reciprocating engines used in islanded power generation.
基金Experimental Study on Seismic performance of ultra-high Performance Concrete Columns(Project No.:Yu Jiao Ke Fa[2024]No.4 KJQN202403808)。
文摘Medium shear span ratio reinforced columns are prone to complex failure under seismic action.This paper compares the seismic performance of normal concrete columns and UHPC columns by introducing ultra-high-performance concrete(UHPC).The shear span ratio(2.4-4.4)and axial compression ratio(0.10,0.36)were used as variables,and the bearing capacity,ductility and failure mode were analyzed through low-cycle reciprocating loading studys.The results showed that UHPC significantly improved the bearing capacity,stiffness and energy dissipation capacity of the column,and suppressed the crushing and spalling of concrete.When the shear span ratio is 2.4 and the axial compression ratio is 0.36,the failure mode of UHPC columns was changed from shear failure to flexural shear failure.Thus this study can become a reference for the seismic design of UHPC columns.
