Compression ratio and mean effective pressure, Mechanical Engineering

Assignment Help:

Compression Ratio:

It is calculated as shown below

2309_Compression Ratio and Mean Effective Pressure.png

Mean Effective Pressure (Pm  or Pmef):

Mean effective pressure is the hypothetical constant pressure that is assumed to be acting on the piston during its expansion stroke producing the same work output as from the actual cycle.

We can say that

2092_Compression Ratio and Mean Effective Pressure1.png

The constant depends on mechanism used to get the indicator diagram and has units bar/m.


Related Discussions:- Compression ratio and mean effective pressure

Calculate the reactive power and current supplied, Question: A series r...

Question: A series resistive inductive load is energised from a 240V (RMS), 50Hz single phase AC supply, such that the load draws 1200W at a power factor of 0.8. a) Calculat

Determine power required and the cop of the system, A Boot Strap Cooling sy...

A Boot Strap Cooling system of 10 TR capacity is used in an aeroplane. The ambient air pressure and temperature are 0.85 and 20 0 C bar respectively. The pressure of air increases

Internal parts of boiler, Internal Parts of boiler: P r essu r e ...

Internal Parts of boiler: P r essu r e Gauge :   For indicating steam pressure W ater Level Indicator : for indicating water level. Steam Stop Valve : Permits fl

Approximate the tension, Approximate the tension: A copper tube 38 mm ...

Approximate the tension: A copper tube 38 mm external diameter and 35 mm internal diameter is nearly wound with a steel wire of 0.8 mm diameter. Approximate the tension at whi

Kinematics, the velocity of a particle moving along x axis is defined by v=...

the velocity of a particle moving along x axis is defined by v=kx^3-4x^2+6x where v is in m/s,x in m and k is a constant .if k=2 compute the acceleration when x=2m #Minimum 100 wor

What are the special considerations in planning, What are the Special Consi...

What are the Special Considerations in Planning The dimensions of the foundation should be such that for low-speed machines (operating speed less than 500  rpm) the natural fre

What is transmission system and what do you mean by a gear?, (a) What is tr...

(a) What is transmission system? Represent the main components of transmission system with the help of diagram. (b) What do you mean by terms torque, power and RPM? (c) What

Voltage -fundamentals of electricity , Voltage: The voltage is the potent...

Voltage: The voltage is the potential difference between two points. The current flows from higher potential to lower potential. Voltage is measured in volts (V). V = IR

Determine the rankine efficiency, A simple Rankine cycle works between pres...

A simple Rankine cycle works between pressures 0.06 bar and 28 bar, the initial condition of steam being dry saturated. Determine the cycle efficiency, specific steam consumption a

Determine the length of arc, Data given for gear problem T P = 30 TG = ...

Data given for gear problem T P = 30 TG = 80 φ = 20o m = 12 mm Addendum = 10 mm then determine the length of path of contact, length of Arc of contact and contact Ratio.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd