Indicated power of engine

It is determined by the analysis of indicator cards made during engine tests. This is a measure of the work done in drawing a fresh mixture through the induction system into the cylinder and to expel the burnt gases out of the cylinder and through the exhaust system.

For any engines there will be two Mean effective pressures.

Indicated power of engine. Indicated power is the theoretical power produced by the engine due to expansion of burning gases. It is measured by the pressure being developed inside the combustion chamber using an engine indicator set up. Indicated power Pm L A N.

Pm - Mean indicated pressure. A - Area of piston. L - Length of stroke.

N - Number of strokes per second. The total indicated power is calculated as follows. The area of each power diagram is found by a planimeter or by use of Simpsons rulesThis area is given in mm 2.

The area divided by length of the diagram in mm is the mean height of the diagram given in mm. The main spring of the instrument has a spring constant given by 1 mm x KNM 2. Indicated Power P m L A N a l x k bar x L m x A m 2 x N 1s bar x m x m 2 x 1s 10 5 Nm2 x m x m2 x 1s 10 5 Nms 10 5 Jouless 10 5 Watts.

Hence multiply the result obtained from calculating indicated power with 10 5 and the final unit will be in Watts. The above equation is valid for 2 stroke engine. This video includes a simple explanation of the power calculation procedure of an diesel engine.

Indicated power The power developed in an engine cylinder. It is determined from an indicator diagram and certain basic information about the engine. Indicated power formulaEasy explanationThis channel is for Mechanical diploma students Channel.

MechTech KnowHowPlease like comment share with others an. Engine Indicated Power P i. Imep is the indicated mean effective pressure Nm 2 A c cylinder area m 2 L stroke length m n number of cylinders N engine speed rpm z 1 for 2 stroke engines 2 for 4 stroke engines V c cylinder swept volume m 3 V e engine swept volume m 3 T i engine indicated torque Nm ω engine angular speed 1s Engine Mechanical Efficiency h m.

H m mechanical efficiency P b engine brake power. IMEP Indicated work out put per cylinder per mechanical cycle Swept volume per cylinder. PMEP Pumping Mean Effective Pressure.

This is a measure of the work done in drawing a fresh mixture through the induction system into the cylinder and to expel the burnt gases out of the cylinder and through the exhaust system. 1Indicated power of a Four-stroke Engine IP Pm L A N KW 600002 PmActual Mean Effective pressureNm2 LLength of strokem AArea of cross section of the cylinderm2 NRPM of engine crankshaft 6. 2Indicated power of a Two-stroke Engine IP Pm L A N KW 60000 PmActual Mean Effective pressureNm2 LLength of strokem AArea of cross section of the cylinderm2 NRPM of engine.

The average pressure inside the cylinders of the internal combustion engine based on the resulted power output. For any engines there will be two Mean effective pressures. One is Specific Indicated Mean Effective Pressure pim and the Second.

Indicated Horse power is the actual power developed by the engine whereas Brake Horse Power is the available power which is almost about 70 to 85 of the actual power developed inside the engine. You can calculate the Indicated Horse Power of a 4-stroke engine by the following formula - IHP PLAN x n 2 4500. When air and fuel or gas goes into an IC engine the output products are.

Power exhaust and heat. Yet the output power differs from the power developed by the gas mixture in the cylinder. This power is called the indicated power.

In order to get the indicated power one needs to find the work done per unit time. According to different engine cycle simulations for a highly turbocharged engine with Miller timing and an indicated mean effective pressure pmi 30 bar values of pex 11 bar and Tex 1000 K can be considered representative. For the sake of simplicity no scavenging is considered.

Indicated Power of an engine the useful work performed by the gases in the cylinder of a piston engine per unit time. It is determined by the analysis of indicator cards made during engine tests. The indicated power of a given engine is different under different operating conditions.

The indicated power of an IC engine briefly written as IP is the power actually developed by the engine cylinder.