Effect of initial pressure upon laminar burning velocity of gaseous fuel in closed vessel

Dissertant

Salih, Adil Mahmud

University

University of Technology

Faculty

-

Department

Department of Electrical Engineering

University Country

Iraq

Degree

Ph.D.

Degree Date

2006

English Abstract

The burning velocity is defined as the velocity at which unburned gases move through the combustion wave in the direction nominal to wave surface.

It is used in many areas of combustion science such as in designing burners and predicting explosions.

In this research a measurement system has been designed to measure the laminar burning velocity using a modern technique, which uses thermocouples for measurement coupled to a computer.

A control system (interface) of software and hardware has been designed to connect the computer to the measurement system.

The system is used to measure the laminar flame speed of (methane, propane, Iraqi LPG and butane)-air mixtures, by predicting the flame front pass time through the thermocouple system.

The experimental used cylinder with (305mm) diameter, (305mm) length and (11.5mm) thickness ignited centrally at initial condition T0 = 298K and at different initial pressures (0.5, 0.75, 1, 1.25 and 1.5) bar.

The mixtures were prepared in a mixing unit, which was designed for this purpose.

The mixing is based on the partial pressure of constituents.

The experimental work was carried out at the pre-pressure period in order to use density ratio method for the calculation of the laminar burning velocity.

The flame temperature (adiabatic flame temperature) used in predicting the burning velocity, is calculated theoretically and compared with the previous published results.

A computer program was written to calculate the burning velocity, the thermal properties of the reactants and products of combustion as well as the flame thickness.

The effect of number of carbon atoms and initial pressure on the laminar burning velocity was studied and the measurements were made at the cylinder.

It was noticed that as the number of carbon atoms increases the laminar burning velocity decreases and the laminar burning velocity decreases with increasing the initial pressure.

An empirical equation has been derived to calculate the laminar burning velocity.

It takes into consideration the effects of equivalence ratio, initial pressure and number of carbon atoms on laminar burning velocity as well as the reciprocal effects of these variables.

The values of the laminar burning velocity calculated from this equation show a great compatibility with the published results.

The results of the research show an acceptable agreement with previous published results.

Main Subjects

Chemistry

Topics

• Fluid dynamics

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-305607