Engine Project Assignment

Overview: Using the available information for a given vehicle, perform an Otto cycle analysis to calculate engine power and efficiency. Compare the calculated and rated power. The grading rubric for this project is included on the final page.

Determining Power and Efficiency of an Engine

SHOW ALL EQUATIONS AND UNITS FOR ALL CALCULATIONS. As you go along, you may want to automate the calculations in Excel and$/$or use Octave to make corrections more easily AND to assist in the project requirements detailed on the last page of this document.

Choose a vehicle and find the following information, noting sources, and record it below:

$\backslash$table$[[$Vehicle make, model and year:,,$],[$Engine configuration and number of cylinders,,$],[($V$-8,$ inline $4,$ etc...$),,---$ TDC$],[$Cylinder bore $[$mm$],,],[$Cylinder stroke $mm,,],[$Capacity $($cc$,$ cubic inches, liters, or displacement$),,],[$Power $($and the corresponding rpm$),,],[$Compression ratio,,$],[$Source of Information:,,$]]$

Determine the SWEPT VOLUME FOR A SINGLE CYLINDER from the engine capacity $($NOT the cylinder dimensions$).$ Swept volume is the difference between the volume at BDC and the volume at TDC$,$ it is not the volume at BDC$.$

$1$

What are the assumptions that you need to analyze the engine as an ideal Otto cycle? $q,q,q,$

$\backslash$table$[[\backslash$table$[[$Draw the P$-$V diagram for an ideal Otto$],[$cycle$,$ numbering each state starting with $1],[$at the intake condition.$]],$Describe the four processes in an ideal Otto cycle.$],[,$State $1$ to State $2$:$],[$State $2$ to State $3$:$],[$State $3$ to State $4$:$],[$State $4$ to State $1$:$]]$

Since you can determine the work done in a piston$-$cylinder from the pressure and volume, fill out the shaded portion of the table below using what you know about your engine and the ideal Otto cycle.

$\backslash$table$[[,$State $1,$State $2,$State $3,$State $4],[p(kPa),,,,],[V(m^3),,,,],[T(K),,,,]]$

HINTS:

a$)$ State $1$ is ambient air.

b$)$ The volumes at TDC $($clearance volume$)$ and BDC $($swept volume $+$ clearance volume$)$ can be determined using the compression ratio. BE CAREFUL: The capacity of the engine is NOT $V_1.$

$\backslash$table$[[$Volume $1,$Volume $2,$Pressure $2,$Temperature $2],[,,,],[,,,],[,,,]]$

$2$

Week $4$: Turbine

Steam enters an adiabatic, isentropic turbine at

$8$ MPa and $430C$ with a flow rate of $45k\frac{g}{s}.$ It

exits the turbine at $76C$ with a quality of $0\mathrm{.}87.$

Draw the system you are analyzing,

including the system boundary and all

interactions between the system and

surroundings. $\{$Include sketch with

support work$\}$

Write the conservation of energy

equation as it applies to your system.

$\{$Include equation with support work$\}$

Calculate the power output $kW$ of the

turbine. $\{$Include calculations with

support work$\}$