Accession Number:

ADA183786

Title:

A Heat Transfer Model for a Heated Helium Airship

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

• Rapert, Ray M.

Report Date:

1987-03-01

Pagination or Media Count:

85.0

Abstract:

Basic heat transfer empirical and analytic equations are applied to a double envelope airship concept which uses heated Helium in the inner envelope to augment andor control gross lift. The convective and conductive terms lead to a linear system of five equations for the concept airship, with the nonlinear radiation terms included by an iterative solution process. A FORTRAN program, is used to perform the tedious calculations, and graphed results are obtained for the variables of interest. These indicate that the simple use of airship engine exhaust heat will give more than a 30 increase in gross airship lift. Possibly more than 100 increase can be achieved if a steam injection heating system, with associated design problems, is used. Theses

Descriptors:

• *HEAT TRANSFER
• *HOT GASES
• *AIRSHIPS
• COMPUTER PROGRAMS
• LINEAR SYSTEMS
• CONTROL
• INJECTION
• RADIATION
• MODELS
• CONDUCTIVITY
• THESES
• CONVECTION
• FORTRAN
• NONLINEAR SYSTEMS
• SOLUTIONS(GENERAL)
• HEATING
• ENGINES
• HELIUM
• EQUATIONS
• HEAT
• LIFT
• STEAM
• ENVELOPE(SPACE)

Subject Categories:

• Lighter-than-air Aircraft
• Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE