Analysis of Engine Performance

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Presentation transcript:

Analysis of Engine Performance P M V Subbarao Professor Mechanical Engineering Department How to Achieve higher Performance?

James Watts Solution

Cycle Performance Parameters Net Work Transfer : This is work done by working fluid on the piston, also called as Indicated Work. Indicative Performance:

I.C. Engine Test Rig

Specific Fuel Consumption Fuel consumption of an engine reported in L/h or kg/h because these values ignore engine power. A better measure of fuel consumption is, XSFC – specific fuel consumption (kg/kWh). X must always be specified when reporting these values (i.e., I for indicated)

Specific Fuel Consumption Variations ISFC – indicated specific fuel consumption BSFC - brake specific fuel consumption PSFC – PTO specific fuel consumption DSFC – drawbar specific fuel consumption

Parameters for Performance Diagnosis Indicative Mean Effective Pressure: Actual Fuel- Air Ratio : Stoichiometric Fuel- Air Ratio : Fuel Air Equivalence Ratio:

Selection of Mixture Strength for Better Reaction -1 Air-standard Analysis Fuel-Air Analysis Experimental Results Rich Lean

Selection of Sufficient Air : Optimization of Total Cost

Combined Thermodynamic & Chemical Optimization for Better Reaction -2

Combined Thermodynamic & Kinetic Optimization for Better Reaction -2

Engine Capacity Vs Performance

Optimizing Engine Performance Engines are most efficient at or near peak load. Efficiency drops with a reduction in torque load. At zero brake torque, all fuel energy is expended in engine friction. Lower rated engine speeds provide lower BSFC, and at the same time reduce torque reserve – design compromise. Heavy engines for a given capacity….. More inertial losses… Compromise – Necessary Evil ….. Any alternate to overcome this fact….. Develop an idea to Change natural behaviour…..

Artificial Breathing Attachments to Engines Preferred Artificial Breathing ….

Engine Artificial Respiratory System An Inclusion of A Pure CV Super Charged Engine

Turbo Charging of Engine : An Inclusion of two PURE CVs Turbo-Charged Engine

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