AN EVAPORATIVE FILM CALORIMETRIC ENTHALPY PROBE.
Abstract
The probe can operate continuously in a high temperature environment, such as an arc. By evaporating a liquid film, the probe cools a hot gas stream to a temperature capable of being measured by conventional instrumentation. The exit temperature and composition of the gas provide the major information for an energy balance on the system. Calculation of the enthalpy of the hot gas is then possible. Several probe models, ranging in outside diameter from 0.10 to 0.050 inch, were fabricated and tested. To simplify internal transpiration studies, the larger probes were separately cooled externally by forced convection. Later probes were entirely cooled by evaporating films permitting greater miniaturization. Improvements in successive probe models are discussed. These improvements were implemented by studies on models utilizing separate internal and external transpiration coolant channels and by applying small diameter (0.001 inch) orifices. Analytical results which may be useful in probe design are also given. An instrument for measuring the exit gas composition has been developed. The described model is structurally rigid for improved stability compared to previous models. The instrument operates with an accuracy compatible with enthalpy probe requirements. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1965
- Accession Number
- AD0615461
Entities
People
- Donald E. Adams
Organizations
- Calspan