Answers to Assignment 2

Question #1:

Run the case at 1800 rpm and list down important parameters (20 Marks)

• air flow rate
• BMEP
• BSFC
• In-cylinder pressure

Answer #1

The 1cylSI-final.gtm files was loaded in to GT-ISE, and run. Report table was created that has engine geometry, operating condtions, etc. The Engine geometry inputs are shown below:

The values of the output requestes is as Follow:

• Air flow rate: 58.6
• (Brake mean effective pressure) BMEP = IMEP - FMEP =12.85-1.72 = 11.3 bar (shown in image below)

• BSFC (Brake specific fuel consumption): 241.8 g/kW-h (shown in above image)
• In-cylinder pressure (maximum pressure): 58.9 bar

Question #:

2. Increase the power output at 3600 rpm by 10%

Answer #2:

I created a parameter [bore] and [stroke] in the 1cylSI-final.gtm file and created a new case setup where I changed the bore diameter from 86mm to 89mm and stroke from 86.07mm to 89.07 mm and ran the solution.

This raised the Brake Power from 16.7 to 18.6, a 10% increase in power.

Changed in other parameters are shown in the image below.