AEROSPACE ENGINEERING LABORATORY (MAE308)

PROF. SEUNG WOOK BAEK DEPARTMENT of AEROSPACE ENGINEERING, KAIST, IN KOREA

ROOM: Building N7-2 #3304 TELEPHONE : 3714 swbaek@kaist.ac.kr http://procom.kaist.ac.kr

TA : Donggi Lee ROOM: Building N7-2 #1304 TELEPHONE : 5754 kingdonggi@kaist.ac.kr

PROF. SEUNG WOOK BAEK DEPARTMENT of AEROSPACE ENGINEERING, KAIST, IN KOREA

ROOM: Building N7-2 #3304 TELEPHONE : 3714 swbaek@kaist.ac.kr http://procom.kaist.ac.kr

TA : Donggi Lee ROOM: Building N7-2 #1304 TELEPHONE : 5754 kingdonggi@kaist.ac.kr

PROPULSION AND COMBUSTION LABORATORY AEROSPACE ENGINEERING LABORATORY

MAE 308

Contents

A. Objective

B. Necessity

C. Background

Measurement of Heat Release usingBomb Calorimeter

PROPULSION AND COMBUSTION LABORATORY AEROSPACE ENGINEERING LABORATORY

MAE 308

Objective

Purpose of Experiment

• Measurement of the calorific value of reactants

Calorific Value

Change of state

Chemical reaction

Formation of a solution

Measurement !!

PROPULSION AND COMBUSTION LABORATORY AEROSPACE ENGINEERING LABORATORY

MAE 308

Necessity

Bomb Calorimeter

• In combustion process

Ex-per-imen

t

• Combustion of fuel• Measurement of the exchange of heat

Analysis

• Thermal characteristic analysis• Calculation of calorific value

Ap-pli-

cation

• Fundamental data for chemical energy

PROPULSION AND COMBUSTION LABORATORY AEROSPACE ENGINEERING LABORATORY

MAE 308

Necessity

Heat Transfer

• The process of reaching thermodynamic equilibrium

PROPULSION AND COMBUSTION LABORATORY AEROSPACE ENGINEERING LABORATORY

MAE 308

Necessity

Predicting Unknown Substances

• By experiments (Calorimeter)- Fuel testing- Propellant and explosive testing

∆ 𝑬Products

KnownUnknown

Prediction

PROPULSION AND COMBUSTION LABORATORY AEROSPACE ENGINEERING LABORATORY

MAE 308

Background

The First Law of Thermodynamics

“ Energy can be neither created nor destroyed during a process ; it can only change forms”

• Energy is conserved in any chemical reaction.

where = heat added to system(positive) = internal energy= work done by system

PROPULSION AND COMBUSTION LABORATORY AEROSPACE ENGINEERING LABORATORY

MAE 308

Background

Closed System

( internal combustion engine, etc.)

• For constant volume process ()» Internal energy change

𝜹𝑾=∫𝟏

𝟐

𝑷𝒅𝑽

𝜹𝑸=𝒅𝑬+𝑷𝒅𝑽

𝜹𝑸=𝒅𝑬

PROPULSION AND COMBUSTION LABORATORY AEROSPACE ENGINEERING LABORATORY

MAE 308

Background

Open System

( pump, turbine, compressor etc.)

• For constant pressure process ()» Enthalpy change

𝜹𝑾=∫𝟏

𝟐

𝑽𝒅𝑷

𝜹𝑸=𝒅𝑯 −𝑽𝒅𝑷

𝜹𝑸=𝒅𝑯

PROPULSION AND COMBUSTION LABORATORY AEROSPACE ENGINEERING LABORATORY

MAE 308

Background

Calorimetry

• The measurement of heat is generated (exothermic process) or consumed (endothermic process) during a chemical reaction or event involving heat transfer.

PROPULSION AND COMBUSTION LABORATORY AEROSPACE ENGINEERING LABORATORY

MAE 308

Background

Calorimeter

• In many cases, the study of heat exchange is measured with an apparatus called a calorimeter.