Predicting Smoke Detector Responce Using a Quantitative Salt-Water Modeling Technique

This investigation provides a detailed analysis of the hydraulic analogue technique used as a predictive tool for understanding smoke detector response within a complex enclosure. There currently exists no collectively accepted method for predicting the response of smoke detectors…


Chapter 1. Introduction
1.1 Overview
1.2 Literature Review
1.3 Research Objectives
Chapter 2. Scaling 15
2.1 Appropriate Scales for Fire / Salt-Water Analogy
2.1.1 Determination of the Velocity Scale
2.1.2 Source Based Scaling for Fires
2.1.3 Source Based Scaling for Salt-Water Analog
2.2 Dimensionless Equations for Fire / Salt-Water Analogy
2.2.1 Governing Equations for the Fire Flow
2.2.2 Governing Equations for the Salt-Water Flow
Chapter 3. Experimental Approach
3.1 Experimental Test Facility
3.1.1 Gravity Feed System
3.1.2 Model Description
3.1.3 Injection System
3.1.4 Recirculation System
3.1.5 Positioning System
3.1.6 Optics
3.1.7 Image Acquisition
3.2 Quantitative Methodology
3.2.1 Injection Consideration
3.2.2 PLIF Requirements
3.2.3 Optimizing Image Quality
3.2.4 Light Sheet Distribution
3.2.5 Converting Light Intensity Measurements to Salt Mass Fraction, Ysalt
3.3 Experimental Procedure
Chapter 4. Analysis
4.1 Calculating Dimensionless Parameters for Fire Test Data
4.1.1 Dimensionless Energy Release Rate, Q*
4.1.2 Dimensionless Fire Time, t*fire
4.1.3 Dimensionless Thermal Dispersion Signature, *T θ
4.1.4 Converting Optical Measurements to Smoke Mass Fraction, Ysmoke
4.1.5 Dimensionless Smoke Dispersion Signature, *smoke θ
4.2 Calculating Dimensionless Parameters for Salt-Water Model
4.2.1 Dimensionless Salt Mass Flux, *saltm &
4.2.2 Dimensionless Salt-Water Model Time, t*sw
4.2.3 Dimensionless Salt Dispersion Signature, *sw θ
4.3 Converting from Salt-Water to Fire Quantities
Chapter 5. Results and Discussion
5.1 Salt-Water Dispersion Analysis
5.1.1 Initial Plume and Ceiling Jet
5.1.2 Initial Doorway Flow Dynamics
5.1.3 Corridor Frontal Flow Dynamics
5.1.4 Secondary Doorway Flow Dynamics
5.2 Fire Response Time Analysis
5.2.1 Local Conditions at the Time of Alarm
5.2.2 Dispersion and Detector Response Times
5.3 Predicting Detector Response Time
5.3.1 Front Arrival Comparison
5.3.2 Activation Lag Time
5.3.3 Detector Response Time Predictions
5.4 Salt-Water and Fire Dispersive Parameter Comparison
5.4.1 Dispersion Comparison at Activation Time
5.4.2 Evolving Dispersion Signature Comparison
Chapter 6. Conclusions
Appendix A: Experimental Results
Appendix B: Check List
Appendix C: Experimental Procedure

Author: jankiewicz, sean

Source: University of Maryland

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