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Variable altitude diesel engine power recovery method based on two-stage supercharging energy difference

A technology for power recovery and supercharging energy, which is applied in mechanical equipment, engine control, combustion engines, etc., can solve the problems of no patent, etc., and achieve the effect of reasonable design, simple and effective method

Inactive Publication Date: 2021-12-03
SHANGHAI JIAO TONG UNIV
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  • Variable altitude diesel engine power recovery method based on two-stage supercharging energy difference
  • Variable altitude diesel engine power recovery method based on two-stage supercharging energy difference
  • Variable altitude diesel engine power recovery method based on two-stage supercharging energy difference

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Embodiment

[0023] Specific examples figure 1 and figure 2 shown. First, solve the operating characteristics of the two-stage booster system according to the formulas (1), (2), and (3), such as figure 2 shown. exist figure 2 The two graphs above the X-axis of the graph represent the total operating characteristics of the two stages, and the graphs below the X-axis represent the influence of the equivalent area ratio of the high and low pressure stage turbines on the energy distribution between the stages.

[0024] π c =f(Γ,π T ) (1)

[0025]

[0026]

[0027] In the formula: π c is the compressor pressure ratio; π T is the turbo expansion ratio; Γ is the temperature efficiency coefficient; m is the dimensionless flow rate; R is the gas constant; T T is the turbine inlet temperature in K; A HT is the flow area of ​​the high-pressure stage turbine, in m 2 ;A LT is the flow area of ​​the high-pressure stage turbine, in m 2 ;P 0 is the plain atmospheric pressure, in Pa;...

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Abstract

The invention discloses a variable altitude diesel engine power recovery method based on two-stage supercharging energy differentiation in the technical field of internal combustion engines. The method comprises the following steps: the limit power recovery altitude of a diesel engine is predicated, and estimating is carried out to obtain the variable altitude air inlet demand and the total energy demand of the diesel engine; through operation point calculation and turbine matching of all stages of gas compressors, a reference matching scheme of high-pressure and low-pressure gas compressors is obtained, and an optimized matching scheme of high-pressure and low-pressure turbines is obtained; by matching the flow area of the high-pressure stage turbine, the total supercharging energy requirements under different altitude working conditions are met; a power recovery economical path is determined according to the throttling characteristic of series connection of the two stages of turbines; and the inter-stage energy distribution optimization under different altitude working conditions is realized by matching the flow area of the low-pressure stage turbine. Through differential distribution of two-stage supercharging energy, the total energy demand problem is solved through high-pressure-stage matching, the energy distribution problem is solved through high-pressure-stage and low-pressure-stage area ratio matching, and diesel engine power recovery under variable altitudes can be achieved.

Description

technical field [0001] The invention relates to a power recovery method in the technical field of internal combustion engines, in particular to a method based on two-stage supercharged energy differentiation that solves the problem of total energy demand by matching high-pressure stages and solves the problem of energy distribution by matching the area ratio of high and low pressure stages. Altitude Diesel Engine Power Restoration Method. Background technique [0002] my country's plateau topography has the characteristics of wide area, high altitude and large span. The area above 3km above sea level accounts for 26% of my country's land area. Diesel engine is the leading power device of heavy construction machinery and land equipment, and its variable altitude performance is related to the progress of my country's western development and the territorial security of Southwest China. However, the high-altitude low-density environment results in insufficient diesel power. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D23/00F02B37/24
CPCF02D23/00F02B37/24F02D2200/70Y02T10/12
Inventor 邓康耀杨名洋石磊马泽泰张琨杨震寰
Owner SHANGHAI JIAO TONG UNIV
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