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⛄ 内容介绍
Brake specific fuel consumption (BSFC) is a parameter that reflects the efficiency of a combustion engine which burns fuel and produces rotational power (at the shaft or crankshaft). In automotive applications, BSFC is used to evaluate the efficiency of the internal combustion engines (ICE). The keyword “brake” is related to the use of a dynamometer (electrical brake) to measure the engine parameters (fuel mass flow rate, torque, etc.).
An internal combustion engine requires fuel and air to produce energy. The amount of fuel used is usually measured on a dynamometer, as a mass flow rate, in kilograms per second [kg/s]. This parameter can not be used to evaluate the efficiency of the engine because it is not obvious how much power we can extract from the fuel. Therefore by dividing the fuel mass flow rate [kg/s] to the engine output power [W], we obtain the brake specific fuel consumption [kg/J]:
⛄ 部分代码
clear
close all
clc
%% aero data
Sref=0.6 ;% m2
aero_UAV=xlsread('UAVdata.xlsx','A:C');
CL_uav=aero_UAV(:,1);
CD_uav=aero_UAV(:,2);
% polynomial for drag polar
DP=polyfit(CL_uav,CD_uav,2);
CD_fit=DP(1)*CL_uav.^2+DP(2)*CL_uav+DP(3);
%% propeller data
Dprop= 0.482 ;%m
J=xlsread('UAVdata.xlsx','P3:P16');
%% CP vs J coeff
p0=0.03840634;
p1=0.04503419; %x
p2=-0.06173971; %x2
p3=-0.06297906; %x3
%% engine data
load engine_data.mat
[C,h]=contourf(xx,yy,Zeng,'LevelList',300:20:600);
clabel(C,h)
hold on
[C1,h1] =contour(xx,yy,Zeng,'LevelList',600:100:3000);
clabel(C1,h1);
xlabel('RPM')
ylabel('Engine torque')
⛄ 运行结果
