TE LAB-PERFORMANCE TEST ON 2-STROKE SINGLE CYLINDER PETROL ENGINE WITH ROPE BRAKE LOADING

Ex.No:                                                                                                                         Date:

 

PERFORMANCE TEST ON 2-STROKE SINGLE CYLINDER PETROL ENGINE WITH ROPE BRAKE LOADING

Aim: 

To conduct performance test on 2-stroke single cylinder petrol engine and to measure the BHP at constant speed keeping different load, air consumption at variable speed and air consumption.

 

Specifications of Engine:

Two stroke single – cylinder petrol engine, air cooled engine (Bajaj Scooter Engine).

Rated Speed                 : 1000 rpm.

Starting by        : Kick Starting.

Loading            : Rope break load drum dia.200mm.

 

Procedure:

·                   Fill the fuel tank with clean fuel.
·                   Check the sufficient lubrication oil in the oil sump (crank case).
·                   Connect the control panel to electrical mains 230V.
·                   Start the engine by cranking the crankshaft manually.
·                   Load the engine by rotating the wheel so that the in steps of 2,3,6,8 kgs to                              get load up to 75% of maximum load capacity.
·                   Repeat the procedure for different loads to conduct the load test.
·              Each time note down the manometer reading fuel consumption reading and rpm.
·                   Note down the temperature readings for final reading to calculate heat balance                   sheet at full load.

 

Observations:

Specific gravity of petrol = 0.65 grms/cc

 Diameter of orifice = 10mm &12.5mm

Calorific value of petrol fuel = 44,500 kJ/kg

Room temperature = T₁⁰C

 

S.No	Engine speed in rpm	Load in kgs		Time taken 5/10 cc/ml of fuel consumption in sec	Manometer reading hm = h1 + h2	Exhaust gas temperature 0C
		Spring balance Reading S1	Spring balance Reading S2
1
2
3
4
5

 

Formulae:

Graph:

BP Vs  hbth,  hIth, , hmech,  BSFC

 

Pre Lab Questions:

1.      What are the 2strokes of SI engines?

2.      What is the working cycle of SI Engine?

3.      List out the performance parameters?

4.      Indicate the different types of loads?

5.      Concept of mass flow rate of air?

Post Lab Questions:

1.      Differentiate brake power and indicated power?

2.      Define brake thermal efficiency?

3.      Indicate mechanical efficiency in terms of BP and IP?

4.      Differentiate SFC and TFC.

5.      List out the performance parameters?

 

Conclusion:

PO Attainment:

Composed By:  

 R.Satheesh, M.E., Asso.Prof.,