Simulation analysis of longitudinal ventilation system with jet fan speed control for MPC strategy in a road tunnel

2012 ◽  
Author(s):  
Z. Tan ◽  
Z.Y. Huang ◽  
K. Wu ◽  
L.T. Xu
Keyword(s):  
Simulation Analysis ◽  
Ventilation System ◽  
Speed Control ◽  
Road Tunnel ◽  
Longitudinal Ventilation ◽  
Jet Fan ◽  
Fan Speed

COMPARISON BETWEEN LONGITUDINAL VENTILATION SYSTEM AND POINT EXTRACTION SYSTEM IN ROAD TUNNEL FIRE SAFETY

2021 ◽  
Vol 77 (1) ◽  
pp. 41-59
Author(s):  
Ti-Sheng HUANG ◽  
Nobuyoshi KAWABATA ◽  
Miho SEIKE ◽  
Masato HASEGAWA ◽  
Futoshi TANAKA ◽  
...  
Keyword(s):  
Fire Safety ◽  
Ventilation System ◽  
Extraction System ◽  
Road Tunnel ◽  
Tunnel Fire ◽  
Longitudinal Ventilation

scholarly journals Numerical Study of Smoke Propagation in a Simulated Fire in a Wagon Within a Subway Tunnel

2008 ◽  
Author(s):  
Felipe Vittori ◽  
Luis Rojas-Solo´rzano ◽  
Armando J. Blanco ◽  
Rafael Urbina
Keyword(s):  
Numerical Study ◽  
Ventilation System ◽  
Road Tunnel ◽  
Subway Tunnel ◽  
Longitudinal Ventilation ◽  
Emergency Ventilation ◽  
Tunnel Section ◽  
Fire Scenarios ◽  
Subway Stations ◽  
Set Up

This work deals with the numerical (CFD) analysis of the smoke propagation during fires within closed environments. It is evaluated the capacity of the emergency ventilation system in controlling the smoke propagation and minimizing the deadly impact of an eventual fire in a wagon within the Metro de Caracas subway tunnel on the passengers safety. For the study, it was chosen the tunnel section between Teatros and Nuevo Circo subway stations, which consists of two parallel independent twin tunnels, connected through a transverse passage. The tunnels are provided by a longitudinal ventilation system, integrated by a set of reversible fans located at both ends of the tunnels. Three stages were considered in the study: (a) Model set up; (b) Mesh sensitivity analysis; (c) Validation of the physical-numerical parameters to be used in the numerical model; and (d) Simulation of fire scenarios in Metro de Caracas subway stations. Stages (b)–(c), aimed to testing and calibrating the CFD tool (ANSYS-CFX10™), focused on reproducing experimental data from Vauquelin and Me´gret [1], who studied the smoke propagation in a fire within a 1:20 scale road tunnel. Stage (d) critical scenarios were established via a preliminary discussion with safety experts from Metro de Caracas, in order to reduce the computer memory and the number of simulations to be performed. The analyses assessed the reliability of escape routes and alternative paths for the evacuation of passengers. Additionally, the smoke front movement was particularly computed, as a function of time, in order to determine the possible presence of the “backlayering” phenomenon [5]. Results demonstrate the strengths and weaknesses of the current ventilation system in the event of a fire in the subway tunnel, and suggest new strategies to address this potentially lethal event to minimize the risks for passengers.

scholarly journals Numerical 3D Simulation of a Longitudinal Ventilation System: Memorial Tunnel Case

2006 ◽  
Author(s):  
Monica Galdo-Vega ◽  
Rafael Ballesteros-Tajadura ◽  
Carlos Santolaria-Morros
Keyword(s):  
Numerical Models ◽  
Ventilation System ◽  
Fire Behavior ◽  
Full Scale ◽  
3D Simulation ◽  
Full Scale Test ◽  
Road Tunnel ◽  
Tunnel Fire ◽  
Longitudinal Ventilation ◽  
Scale Test

In this work, a numerical 3D simulation of a longitudinal ventilation system is developed to analyze the fire behavior inside a road tunnel. Recent disasters, like crashes in the Mont Blanc tunnel (France, 1999) or San Gottardo (Italy, 2001), have shown the need for better integral actions during possible fire incidents. The minimum delay time, required for starting the jet fans, or the evolution of the smoke patterns inside the tunnel are critical issues when rescue plans are designed. Some methods to study the smoke propagation during a fire are: pseudo-thermal scale models, full scale test and numerical models. Several contributions using the first method can be found in references [1], [2] and [3]. However it is very difficult to extrapolate the results from this kind of models. The second method (full scale test) is the most expensive of all and only two of them have been conducted recently: EUREKA Project [4] and the Memorial Tunnel Fire Ventilation Test Program [5]. The last method (numerical models) it is now under development. The objective of this work is to validate a numerical model, to predict the behavior of the smoke generated during a fire incident inside a road tunnel, comparing its results with previous experimental data collected in the Memorial Tunnel Project. In addition, a good agreement was achieved, so a methodology to predict the performance of a longitudinal ventilation system in case of fire was accurately established.

scholarly journals Study on Hot Gases Flow in Case of Fire in a Road Tunnel

2018 ◽  
Author(s):  
Aleksander Król ◽  
Małgorzata Król
Keyword(s):  
Temperature Distribution ◽  
Initial Phase ◽  
Ventilation System ◽  
Main Axis ◽  
Road Tunnel ◽  
Ansys Fluent ◽  
The Road ◽  
Longitudinal Ventilation ◽  
Australian Standard ◽  
Recorded Data

This paper presents the results of hot smoke tests, conducted in a real road tunnel. The tunnel is located within the expressway S69 in southern Poland between cities Żywiec and Zwardoń. Its common name is Laliki tunnel. It is a bi-directional non-urban tunnel. The length of the tunnel is 678 m and it is inclined by 4%. It is equipped with the longitudinal ventilation system. Two hot smoke tests have been carried out according to Australian Standard AS 4391-1999. Hot smoke tests corresponded to a HRR (Heat Release Rate) equal to respectively 750 kW and 1500 kW. The fire source was located in the middle of the road lane imitating an initial phase of a car fire (respectively 150 m and 265 m from S portal). The temperature distribution was recorded during both tests using a set of fourteen thermocouples mounted at two stand poles located at the main axis of the tunnel on windward. The stand poles were placed at distances of 5 m and 10 m. The recorded data were applied to validate of a numerical model built and solved using Ansys Fluent. The calculated temperature distribution matched the measured values.

Theoretical Analysis of Longitudinal Ventilation System in a Road Tunnel for Predictive Control Based on Inertia Effect

2013 ◽  
Vol 639-640 ◽  
pp. 665-669 ◽  
Author(s):  
Zhen Tan ◽  
Zhi Yi Huang ◽  
Ke Wu ◽  
Lei Ting Xu
Keyword(s):  
Theoretical Analysis ◽  
Predictive Control ◽  
Ventilation System ◽  
Settling Time ◽  
Step Response ◽  
Inertia Effect ◽  
Road Tunnel ◽  
Longitudinal Ventilation ◽  
Road Tunnels ◽  
Co Concentration

Speed control of longitudinal ventilation systems in road tunnels is being combined with typical model predictive control (MPC) strategies which may bring huge energy saving potential to the system. Theoretical analysis of the inertia effect is presented based on the energy equation of one dimensional incompressible unsteady flow, step response model is chosen to describe the dynamic behaviors of the system. The results show that the effect of jet speed change on CO concentration is nonlinear within fan’s economical working range and the settling time of CO level has similar change trend with that of the flow field but is a little longer. The system settling time is longer when jet speed decreases than it increases and is related to the change extent of jet speed. The effect of traffic intensity on CO concentration can be regarded as linear disturbance to the system output. These results may provide useful indexes to control the tunnel ventilation system more economically and lay foundation for the application of predictive control strategy in the system.

Fan Speed Control on Heat Detector Technique Using Zigbex Wireless Sensor Network

2012 ◽  
Vol 622-623 ◽  
pp. 1484-1491
Author(s):  
Murizah Kassim ◽  
Norakmar Arbain Sulaiman ◽  
Mohd Sukri Yang Razali
Keyword(s):  
Wireless Sensor Network ◽  
Sensor Network ◽  
Large Scale ◽  
Speed Control ◽  
Wireless Sensor ◽  
Road Tunnel ◽  
Sensors And Actuators ◽  
Heat Detector ◽  
Study Results ◽  
Fan Speed

this paper presented the study on fan speed control on heat detector technique using Zigbex wireless Sensor Network. The updated wireless application technology called Zigbex wireless sensor network (WSN) is used to simulate the system to control automatically the fan speed. The wireless sensor network will be based on the temperature warmth which reaches at a circumstances heat. This system could be used for the road tunnel fan control system. In wired road tunnel fan control, the system requires high cost installation fees for proper wiring for a large scale implementation. The used of Zigbex WSN platform is to substitute wired sensors and actuators. Measurement level of temperature that used to control the right amount of power could be supplied to the tunnel fan. A NesC program of TinyOS was used where two levels of output is controlled which are for 100%, and 50% duty cycle of Pulse Width Modulation (PWM) signal. Observation of the sensor node that can detect the change in temperature has also been highlighted in this study. Results obtained from the study indicated that Zigbex Wireless Sensor Network is a successful technique for controlling the fan speed on heat

scholarly journals Numerical Analysis for Reduced-scale Road Tunnel Model Equipped with Axial Jet Fan Ventilation System

2014 ◽  
Vol 45 ◽  
pp. 1146-1154 ◽  
Author(s):  
Antonio Costantino ◽  
Marilena Musto ◽  
Giuseppe Rotondo ◽  
Alessandro Zullo
Keyword(s):  
Numerical Analysis ◽  
Ventilation System ◽  
Road Tunnel ◽  
Tunnel Model ◽  
Jet Fan ◽  
Reduced Scale

Pressing speed stability control of a special ceramic roller bearing press based on fuzzy adaptive PID

2021 ◽  
pp. 1-16
Author(s):  
Lijie Yang ◽  
Guimei Wang ◽  
Huadong Zhang ◽  
Jiehui Liu ◽  
Yachun Zhang
Keyword(s):  
Pid Control ◽  
Simulation Analysis ◽  
Roller Bearing ◽  
Speed Control ◽  
Stability Control ◽  
Interference Signal ◽  
Ceramic Roller ◽  
Speed Stability ◽  
Adaptive Pid Control ◽  
Fuzzy Adaptive

A special ceramic roller bearing press (SCRBP) is developed to press two bearings efficiently and precisely at the same time. A speed control mathematical model of the bearing press is built to obtain stability bearing pressing speed. The fuzzy adaptive PID controller of the bearing pressing speed of SCRBP is designed. The simulation model is also built. Fuzzy adaptive PID control is compared with conventional PID control. By simulation analysis, the simulation results show that adjusting time of fuzzy adaptive PID control is short, and its overshoot is very small, almost coincides with the set pressing speed. Moreover, fuzzy adaptive PID is suitable for the pressing speed control of the bearing pressing speed system with step interference signal. The pressing stability speed is obtained by fuzzy adaptive PID control.

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