CN203455152U - General release source device for building ventilation smoke-exhausting experiment - Google Patents
General release source device for building ventilation smoke-exhausting experiment Download PDFInfo
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- CN203455152U CN203455152U CN201320561402.XU CN201320561402U CN203455152U CN 203455152 U CN203455152 U CN 203455152U CN 201320561402 U CN201320561402 U CN 201320561402U CN 203455152 U CN203455152 U CN 203455152U
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Abstract
The utility model relates to a general release source device for a building ventilation smoke-exhausting experiment. The device comprises a medium injection pipe and a buffer chamber. The buffer chamber is connected to the lower end of the medium injection pipe. A medium injection hole is arranged on the wall of the buffer chamber at the joint of the buffer chamber and the medium injection pipe. The buffer chamber is internally provided with an inner flow guide orifice plate, and an outlet flow guide orifice plate is arranged at the bottom of the buffer chamber. A medium enters the buffer chamber through the medium injection hole from the medium injection pipe, passes through the inner flow guide orifice plate, and flows out through the outlet flow guide orifice plate. The medium flowing out of the outlet flow guide orifice plate is a low-speed high-turbulence flow. Compared with the prior art, by the combined action of the medium injection hole and staggered guide orifices on the three layers of orifice plates, the flow speed of the medium is reduced, while the turbulence of the flow is increased, so that the conflict between low speed and high turbulence caused by a non-zero initial momentum of the medium flow in a ventilation smoke exhausting medium experiment is solved, and the error of the experiment is greatly reduced.
Description
Technical field
The utility model relates to hot plume and ventilates and smoke evacuation field, especially relates to a kind of general source of release device for building ventilation smoke evacuation experiment.
Background technology
Along with the fast development of economic society, the raising of Building technology level and people's living standard, increasing large space is built into the residence space into people's work and life, such as market, movie theatre, stadium, factory building, transit centre etc.Modern building is to meet the growing people for the pursuit of quality of the life, continues to bring out the large spaces such as all kinds of Zhongtings in buildings, brings very large pressure to ventilation and the anti-smoke evacuation of buildings.When building at ventilation and smoke exhaust, large space there is at present following problem:
1, large space is owing to existing the thermal convection plume being driven by thermal source to ventilate, thereby caused large space thermally stratified layer, and this phenomenon makes large space in the calculating of air conditioner load, the selection of the control of indoor air quality, air conditioning terminal all has a certain impact, and lack at present thermally stratified layer common feature and theoretical research thereof, mathematical model is not enough, can not form generally acknowledged theoretical system.Therefore the hot plume of studying large space ventilates the load of air is calculated, the choose reasonable of system and end has important effect, and then effectively control indoor harmful gas, particle and disease carrying germ with propagation and the diffusion of Air Flow, and whole air-conditioning system energy-conservation also has important effect.
2, in the smoke exhaust of large space, the thermally stratified layer being caused by flue gas thermal convection plume is also the common phenomenon in inside fire and smoke movement, in existing < < Code for fire protection design of buildings > > GB50016, the regulation of the mechanical smoke extraction amount of the contour large space of Zhongting is also just rested on according to volume and gets rate of ventilation consideration; Do not consider the feature of property of fire source and the large space itself of contingent fire.The density of personnel of volumed space building is larger, during breaking out of fire, is owing to sucking smoke poisoning institute extremely or fainting after poisoning and burnt extremely in casualties mostly.Therefore, in order to guarantee that in fire, personnel have safe fire escape and enough evacuation times before flue gas draws out, the diffusion process of flue gas, the impact of various smoke exhaust method on the impact of flue gas Diffusion Law and the motion of flue gas diffusion couple indoor air flow be need to understand, to determine, the method for smoke diffusion and the mode that establishment officer evacuates effectively controlled.
The anti-smoke evacuation flue gas analysis main method used of ventilating is at present 2 kinds of CFD numerical simulation and model experiments.Wherein, abstract and the boundary condition of CFD simulation based on governing equation simplified, and in the situation that lacking experimental verification, is often difficult to determine the accuracy of result of calculation.And according to similarity theory, set up model, guarantee scaled model and original building space have the way of testing under the prerequisite of identical criterion numeral (Fr, Re) have advantages of do not need to rely on empirical theory, reliability is high.
Model experiment is generally divided into the model test of the same medium of hot blast simulation thermal convection plume, and by model test two classes of the different medium of brine density flow field simulation thermal convection plume.Smoke evacuation and heat are ventilated, and experiment general satisfaction Fr equates, Re approaches, and generally Re number is entered to Zi Mo district as the condition that meets model experiment.Conventionally simulated experiment all has the initial momentum of MEDIA FLOW non-vanishing and caused the error problem of simulation.In actual smoke diffusion process, flue gas is power-actuated by buoyancy or mechanical exhaust, and burning things which may cause a fire disaster has the feature of high turbulent flow low velocity.But in dielectric model experiment, medium injects and has certain initial velocity, and medium moves after injecting under the acting in conjunction of gravity and initial momentum.Meanwhile, for guarantee simulated fire source and high turbulent flow, need to guarantee Re>=10
4guarantee that thereby turbulent flow injection keeps the high-speed turbulent flow that forms, this has just formed contradiction with the condition of low velocity.Simultaneously for Re, count similarity, with medium experiment, be not as accurate as different medium experimental simulation, there is certain error, if but by improving medium releasing means turbulent flow, strengthen, can so that similarity greatly improve.
In order to solve medium, discharge the non-vanishing problem of momentum, the utility model provides a kind of releasing means of simulating the high turbulent flow of thermal source, low velocity feature for building ventilation smoke evacuation experiment.Building fire, hot plume the ventilate key problem of the source conditional likelihood in different medium experiment, significantly the geometric similarity scope of lift scheme experiment have been solved.Improve medium releasing means turbulent flow simultaneously and strengthen, can reduce experimental error so that greatly improve with medium experiment similarity, increase experiment usable range.This device is common in building ventilation smoke evacuation model experiment.
Utility model content
The purpose of this utility model is exactly to discharge the non-vanishing problem of momentum and a kind of general source of release device for building ventilation smoke evacuation experiment is provided in order to overcome the medium of above-mentioned prior art existence, and this device can be simulated the feature of the high turbulent flow of thermal source, low velocity.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of general source of release device for building ventilation smoke evacuation experiment, this device comprises medium ascending pipe and cushion chamber, described cushion chamber is connected to the lower end of medium ascending pipe, on the chamber wall of cushion chamber and medium ascending pipe junction, offer medium filling orifice, the inside of described cushion chamber is provided with internal diversion orifice plate, and the bottom of cushion chamber is provided with outlet guide discharge orifice plate.
Described medium ascending pipe is cylindrical pipe, between medium ascending pipe and cushion chamber, is welded to connect.
Described cushion chamber is circular cylindrical cavity.
Described internal diversion orifice plate is provided with several, the vertical layered inside that is laid in cushion chamber.
As preferably, described internal diversion orifice plate is provided with two altogether, be divided into the upper and lower two-layer cushion chamber inside that is arranged on, two internal diversion orifice plates laying up and down form three layers of orifice plate that be arranged in parallel together with outlet guide discharge orifice plate, on these three layers of orifice plates, all offer some guide holes, and the guide hole on every layer of orifice plate is interlaced.
On described internal diversion orifice plate and outlet guide discharge orifice plate, the percentage of open area of guide hole is 40%～60%.
The aperture of described medium filling orifice is 8～20mm.
Medium enters cushion chamber inside from medium ascending pipe by medium filling orifice, the medium velocity of flowing through after medium filling orifice increases, turbulent flow is strengthened rapidly, the medium internal diversion orifice plate of flowing through again, from outlet guide discharge orifice plate current, go out, internal diversion orifice plate and outlet guide discharge orifice plate carry out current-sharing and further slow down medium, filter the vortex of large scale simultaneously, and the medium going out from outlet guide discharge orifice plate current is the fluid of the high turbulent flow of low velocity.
Medium is the fluid of the high turbulent flow of low velocity from described outlet guide discharge orifice plate current goes out, when this medium is apart from outlet guide discharge orifice plate H
0place's momentum meets
be less than or equal at 0.1 o'clock, be greater than this distance H
0space can ignore the non-vanishing error causing of initial momentum of MEDIA FLOW.In formula, B represents the ratio of the gravity momentum of brine stream, H
0for the distance apart from outlet guide discharge orifice plate, ρ represents to inject brine density, ρ
0represent environment clear water density, V represents the injection rate of brine stream, and g represents acceleration of gravity.
By this device, strengthen the turbulivity of source of release, can so that similarity greatly improve, changed with regard to Re and counted similarity, present situation with medium experiment not as different dielectric testing, make this device can be used for the model test with the same medium of hot blast simulation thermal convection plume, and by the model test of the different medium of brine density flow field simulation thermal convection plume.
Compared with prior art, the utlity model has following advantage and beneficial effect:
(1) by this device, strengthen the turbulivity of source of release, can so that similarity greatly improve, make this device can be used for the model test of same medium with " hot blast " simulation " thermal convection plume ", and by the model test of the different medium of " brine density stream " simulation " thermal convection plume ".
(2) by the acting in conjunction of the guide hole of interlaced setting on medium filling orifice and three layers of orifice plate, reduced to the full extent velocity of medium and increased fluid turbulent degree simultaneously.
(3) solved the contradiction that initial momentum low velocity non-vanishing and that the cause high turbulent flow of ventilation smoke exhaust medium experiment medium stream can not reach simultaneously, in the very big error that has reduced experiment of degree.
(4) the utility model is common in the experiment of the same medium of ventilation smoke exhaust, different dielectric model, for the high turbulent flow simulation in heat (fire) source of building ventilation smoke evacuation experiment provides feasible program, for the large space anti-smoke exhaust that ventilates provides experimental basis.
(5) apparatus structure of the present utility model is simple, is easy to manufacture.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
In figure: 1 is medium ascending pipe, 2 is medium filling orifice, and 3 is internal diversion orifice plate, and 4 is cushion chamber, and 5 is outlet guide discharge orifice plate.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.
Embodiment
A kind of general source of release device for building ventilation smoke evacuation experiment, as shown in Figure 1, this device comprises medium ascending pipe 1 and cushion chamber 4, cushion chamber 4 is connected to the lower end of medium ascending pipe 1, on the chamber wall of cushion chamber 4 and medium ascending pipe 1 junction, offer medium filling orifice 2, the inside of cushion chamber 4 is provided with internal diversion orifice plate 3, and the bottom of cushion chamber 4 is provided with outlet guide discharge orifice plate 5.
Wherein, medium ascending pipe 1 is cylindrical pipe, between medium ascending pipe 1 and cushion chamber 4, is welded to connect.Cushion chamber 4 is circular cylindrical cavity.Internal diversion orifice plate 3 can be provided with several, the vertical layered inside that is laid in cushion chamber 4, in the present embodiment, internal diversion orifice plate 3 is provided with two altogether, be divided into upper and lower two-layer cushion chamber 4 inside that are arranged on, two internal diversion orifice plates 3 laying up and down form three layers of orifice plate that be arranged in parallel together with outlet guide discharge orifice plate 5, on these three layers of orifice plates, all offer some guide holes, and the guide hole on every layer of orifice plate is interlaced.Wherein, on internal diversion orifice plate 3 and outlet guide discharge orifice plate 5, the percentage of open area of guide hole is 40%～60%.The aperture of medium filling orifice 2 is 8～20mm.
Medium enters cushion chamber 4 inside from medium ascending pipe 1 by medium filling orifice 2, the medium velocity of flowing through after medium filling orifice 2 increases, turbulent flow is strengthened rapidly, the medium internal diversion orifice plate 3 of flowing through again, from outlet guide discharge orifice plate 5, flow out, internal diversion orifice plate 3 carries out current-sharing and further slows down with 5 pairs of media of outlet guide discharge orifice plate, filters the vortex of large scale simultaneously, and the medium flowing out from outlet guide discharge orifice plate 5 is the fluid of the high turbulent flow of low velocity.
Medium is the fluid of the high turbulent flow of low velocity from outlet guide discharge orifice plate 5 flows out, when this medium is apart from outlet guide discharge orifice plate 5H
0place's momentum meets
be less than or equal at 0.1 o'clock, be greater than this distance H
0space can ignore the non-vanishing error causing of initial momentum of MEDIA FLOW.In formula, B represents the ratio of the gravity momentum of brine stream, H
0for the distance apart from outlet guide discharge orifice plate, ρ represents to inject brine density, ρ
0represent environment clear water density, V represents the injection rate of brine stream, and g represents acceleration of gravity.
By this device, strengthen the turbulivity of source of release, can so that similarity greatly improve, changed with regard to Re and counted similarity, present situation with medium experiment not as different dielectric testing, make this device can be used for the model test with the same medium of hot blast simulation thermal convection plume, and by the model test of the different medium of brine density flow field simulation thermal convection plume.
Claims (7)
1. the general source of release device for building ventilation smoke evacuation experiment, it is characterized in that, this device comprises medium ascending pipe (1) and cushion chamber (4), described cushion chamber (4) is connected to the lower end of medium ascending pipe (1), on the chamber wall of cushion chamber (4) and medium ascending pipe (1) junction, offer medium filling orifice (2), the inside of described cushion chamber (4) is provided with internal diversion orifice plate (3), and the bottom of cushion chamber (4) is provided with outlet guide discharge orifice plate (5).
2. a kind of general source of release device for building ventilation smoke evacuation experiment according to claim 1, is characterized in that, described medium ascending pipe (1) is cylindrical pipe, between medium ascending pipe (1) and cushion chamber (4), is welded to connect.
3. a kind of general source of release device for building ventilation smoke evacuation experiment according to claim 1, is characterized in that, described cushion chamber (4) is circular cylindrical cavity.
4. a kind of general source of release device for building ventilation smoke evacuation experiment according to claim 1, is characterized in that, described internal diversion orifice plate (3) is provided with several, the vertical layered inside that is laid in cushion chamber (4).
5. a kind of general source of release device for building ventilation smoke evacuation experiment according to claim 4, it is characterized in that, described internal diversion orifice plate (3) is provided with two altogether, be divided into upper and lower two-layer cushion chamber (4) inside that is arranged on, two internal diversion orifice plates (3) of laying up and down form three layers of orifice plate that be arranged in parallel together with outlet guide discharge orifice plate (5), on these three layers of orifice plates, all offer some guide holes, and the guide hole on every layer of orifice plate is interlaced.
6. a kind of general source of release device for building ventilation smoke evacuation experiment according to claim 5, is characterized in that, the percentage of open area of the upper guide hole of described internal diversion orifice plate (3) and outlet guide discharge orifice plate (5) is 40%～60%.
7. a kind of general source of release device for building ventilation smoke evacuation experiment according to claim 1, is characterized in that, the aperture of described medium filling orifice (2) is 8～20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320561402.XU CN203455152U (en) | 2013-09-10 | 2013-09-10 | General release source device for building ventilation smoke-exhausting experiment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320561402.XU CN203455152U (en) | 2013-09-10 | 2013-09-10 | General release source device for building ventilation smoke-exhausting experiment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203455152U true CN203455152U (en) | 2014-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320561402.XU Expired - Lifetime CN203455152U (en) | 2013-09-10 | 2013-09-10 | General release source device for building ventilation smoke-exhausting experiment |
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| Country | Link |
|---|---|
| CN (1) | CN203455152U (en) |
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2013
- 2013-09-10 CN CN201320561402.XU patent/CN203455152U/en not_active Expired - Lifetime
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140226 |
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| CX01 | Expiry of patent term |