Experimental simulations of fire-induced smoke control in tunnels using an “air–helium reduced scale model”: Principle, limitations, results and future

2008 ◽  
Vol 23 (2) ◽  
pp. 171-178 ◽  
Author(s):  
Olivier Vauquelin
Keyword(s):  
Scale Model ◽  
Smoke Control ◽  
Reduced Scale

Reduced-Scale Experiments on Smoke Extraction Capability in Tunnel Fire

2011 ◽  
Vol 90-93 ◽  
pp. 1675-1678
Author(s):  
Lin Xu ◽  
Xue Qing Zhang ◽  
Yong Zhang Cui
Keyword(s):  
Experimental Tests ◽  
Scale Model ◽  
Test Results ◽  
Smoke Control ◽  
Tunnel Fire ◽  
Temperature Distributions ◽  
Heated Air ◽  
Obvious Reason ◽  
Short Time ◽  
Reduced Scale

In case of tunnel fire at congest traffic, central smoke extraction by controlling the longitudinal flow velocity can confine and extract the fire-induced smoke in a short time, and retain the natural stratification as well as possible for obvious reason of safety. With respect to three vents located on both sides of the fire in an asymmetrical arrangement, a series of experimental tests are carried out in a 1/14 reduced scale model tunnel. For the experimental simulations, fire induced smoke is simulated by a heated air release using the model proposed by Mégret et al. Detailed temperature distributions in the tunnel have been carried out. According to the test results, it is difficult to give consideration to the smoke control both upstream and downstream the fire. At critical ventilation, until the exhaust rate Ge is more than 519m3/s, air temperature in the respiratory region can decrease to 322K for people survival.

Structural Analysis for a Reduced Scale Model of a Hydropower Plant Debris Containment Grid

2017 ◽  
Author(s):  
Felipe Santos de Castro ◽  
Eduardo Tadashi Katsuno ◽  
Andre Mitsuo Kogishi ◽  
José Marcos Paz de Souza ◽  
Joao Lucas Dozzi Dantas Dantas
Keyword(s):  
Structural Analysis ◽  
Hydropower Plant ◽  
Scale Model ◽  
Plant Debris ◽  
Reduced Scale

Simulation of a Free Standing Riser Model and Validation With Experimental Results

2014 ◽  
Author(s):  
Marcio Yamamoto ◽  
Sotaro Masanobu ◽  
Satoru Takano ◽  
Shigeo Kanada ◽  
Tomo Fujiwara ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Previous Experiment ◽  
Numerical Results ◽  
Experimental Results ◽  
Previous Article ◽  
Scale Model ◽  
Analysis Software ◽  
Free Standing ◽  
Reduced Scale

In this article, we present the numerical analysis of a Free Standing Riser. The numerical simulation was carried out using a commercial riser analysis software suit. The numerical model’s dimensions were the same of a 1/70 reduced scale model deployed in a previous experiment. The numerical results were compared with experimental results presented in a previous article [1]. Discussion about the model and limitations of the numerical analysis is included.

A Study of Aspiration Effects in Reduced-Scale Model Airbag Modules

1998 ◽  
Author(s):  
Y. G. Lee ◽  
C. S. Yu ◽  
P. W. Green ◽  
L.-D. Chen ◽  
P. B. Butler
Keyword(s):  
Scale Model ◽  
Reduced Scale

Reduced Model Device of Solutions to Control Thermal Buckling Effects in HP-HT Subsea Pipelines

2008 ◽  
Author(s):  
Helio C. Silva-Junior ◽  
Carlos O. Cardoso ◽  
Marco A. P. Carmignotto ◽  
Jose C. Zanutto
Keyword(s):  
Imaging Technique ◽  
Thermal Buckling ◽  
Scale Model ◽  
Reduced Model ◽  
Safe Operation ◽  
High Pressure And Temperature ◽  
Model Geometry ◽  
Subsea Pipelines ◽  
Model Device ◽  
Reduced Scale

Nowadays, the safe operation of HP-HT subsea pipelines resting on seabed must take into account the thermal buckling phenomenon. The transport of oil with high pressure and temperature can cause uncontrolled thermal buckling in subsea pipelines. The failure risk must be carefully evaluated to design the pipeline with safety. Nowadays to control the thermal buckling the use of man made triggers is seen like the best solution for cost and safety of subsea pipelines. Some projects employ man-made triggers to control the thermal buckling in the last years around the world. In this article is presented the system and methodology used to test some solutions in a reduced scale model. Different geometric setups along the model line were tested. Solutions like sleepers, dual sleepers and buoyancy were tested and the geometric and structural behavior monitored. The reduced model has 195 m length, and was developed in the IPT Towing Tank, representing a pipeline section of almost 6 km long. Strains, temperature, pressure and displacements were measured in several sections of the model. Additionally, an imaging technique for the model geometry retrieval was developed. This paper presents the experimental setup developed to investigate the performance of man-made triggers solutions for HP-HT subsea pipelines.

An Experimental Study of the Interaction Between Pipe Structure and Internal Flow

2009 ◽  
Author(s):  
Marcio Yamamoto ◽  
Motohiko Murai ◽  
Katsuya Maeda ◽  
Shotaro Uto
Keyword(s):  
Gas Flow ◽  
Petroleum Industry ◽  
Internal Flow ◽  
Scale Model ◽  
Offshore Platforms ◽  
Drilling Mud ◽  
Well Drilling ◽  
Hydrocarbon Production ◽  
Flow Effects ◽  
Reduced Scale

Nowadays pipes are widely deployed in the offshore environment especially in the petroleum industry where rigid and flexible pipes are used for well drilling and hydrocarbon production. Whereas during drilling, a mixture of drilling mud, rock cuttings and sometimes gas flows through the drilling riser, during production mono or multiphase (comprising oil, water and gas) flow takes place within the system. However up till now, most of the studies on offshore pipelines and risers have been focused on the pipe structure and its interaction with hydrodynamic forces and offshore platforms. In particular for numerical computation studies and reduced scale model experiments, the pipe is usually modeled as a tensioned beam and sometimes only the internal pressure is taken into account with other effects due to its internal flow being neglected. This paper deals with the interaction between the pipe structure and its internal flow. In order to verify the internal flow effects, an experimental analysis was carried out not using a reduced scale model. In particular, mono-phase fluid flows into the pipe and a parametric analysis using the flow rate was carried out. Discussion about the experimental results and numerical applications is also included.

Reduced-scale model study on cable heat dissipation and airflow distribution of power cabins

2019 ◽  
Vol 160 ◽  
pp. 114068 ◽  
Author(s):  
Jiaxu Wang ◽  
Xuefeng Liu ◽  
Siwei Chen ◽  
Hanghang Jiang ◽  
Guanyu Fang ◽  
...  
Keyword(s):  
Heat Dissipation ◽  
Scale Model ◽  
Model Study ◽  
Airflow Distribution ◽  
Distribution Of Power ◽  
Reduced Scale
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