GB2562091A - Optimised tunnel ventilation device - Google Patents
Optimised tunnel ventilation device Download PDFInfo
- Publication number
- GB2562091A GB2562091A GB1707147.3A GB201707147A GB2562091A GB 2562091 A GB2562091 A GB 2562091A GB 201707147 A GB201707147 A GB 201707147A GB 2562091 A GB2562091 A GB 2562091A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fan
- nozzle
- tunnel
- throughbore
- trailing edge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000009423 ventilation Methods 0.000 title claims abstract description 17
- 238000009434 installation Methods 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000030279 gene silencing Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/08—Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/003—Ventilation of traffic tunnels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially adapted for elastic fluid pumps
- F04D29/545—Ducts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially adapted for elastic fluid pumps
- F04D29/545—Ducts
- F04D29/547—Ducts having a special shape in order to influence fluid flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2250/00—Geometry
- F05D2250/50—Inlet or outlet
- F05D2250/51—Inlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2250/00—Geometry
- F05D2250/50—Inlet or outlet
- F05D2250/52—Outlet
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A ventilation fan for a tunnel featuring a rotor 3, attached to a motor 4, and an output nozzle trailing edge 6, which is angled 13 with respect to the fan housing. The nozzle has a throughbore 9, which is aligned with a centerline of the fan 7, and is non-cyindrical, such that the angled trailing edge is circular to permit the installation of a standard bellmouth. The fan may include an inlet nozzle 8, which also has an angled inlet. The straight profile of the nozzles may reduce the pressure drop through the fan, while the angled trailing edge causes the flow to be directed away from a surface of the tunnel. This reduces the power consumption compared to a fan having an angled nozzle throughbore.
Description
(54) Title of the Invention: Optimised tunnel ventilation device
Abstract Title: Tunnel ventilation fan having angled nozzle edges (57) A ventilation fan for a tunnel featuring a rotor 3, attached to a motor 4, and an output nozzle trailing edge 6, which is angled 13 with respect to the fan housing. The nozzle has a throughbore 9, which is aligned with a centerline of the fan 7, and is non-cyindrical, such that the angled trailing edge is circular to permit the installation of a standard bellmouth. The fan may include an inlet nozzle 8, which also has an angled inlet. The straight profile of the nozzles may reduce the pressure drop through the fan, while the angled trailing edge causes the flow to be directed away from a surface of the tunnel. This reduces the power consumption compared to a fan having an angled nozzle throughbore.
Fig. 1
At least one drawing originally filed was informal and the print reproduced here is taken from a later filed formal copy.
/4
2/4
Fig. 2
3/4
4/4
Fig. 4
- 1 OPTIMISED TUNNEL VENTILATION DEVICE
BACKGROUND OF THE INVENTION [0001] Longitudinal ventilation by jetfans is a well-established technique for establishing airflows in tunnels, for the improvement of air quality during normal and congested operations, as well as for the control of smoke during fires.
[0002] A previous patent application number GB2512181 filed by the present Applicant describes an improved jetfan, wherein the angle made between the nozzle trailing edge and a centreline of the nozzle is not perpendicular, and wherein at least one of the nozzle throughbore edges is arranged to turn the flow away from the surrounding tunnel surfaces. That invention reduces the Coanda effect of the jet issued from the jetfan, and hence improves the energy efficiency of the tunnel ventilation.
[0003] The tilting of one of the nozzle throughbore edges to turn the flow away from the surrounding tunnel surfaces in GB2512181 has the effect that the nozzle trailing edge must be tilted through a large angle (around 30°), in order to ensure that the aerodynamic throat of the nozzle throughbore is at least equal to the fan area. Since the airflow enters the jetfan in a direction normal to the inlet nozzle plane, such a large nozzle trailing edge angle can cause the flow to separate from the nozzle inlet, causing additional pressure losses.
[0004] JP-A-H1-237400 discloses a jetfan with an undercut on the lower side of the cylindrical casing, to encourage the discharged air to turn away from the tunnel soffit. However, since the trailing nozzle trailing edge is shaped as an ellipse, it is not feasible to attach commercially available bellmouths on the nozzle trailing edges, which in turn implies significant pressure losses through the jetfan.
[0005] The Applicant believes that there remains scope to improve the energy efficiency of longitudinal tunnel ventilation systems.
-2SUMMARY OF THE INVENTION [0006] According to one aspect of the invention, there is provided a fan assembly for installation in a tunnel to provide ventilation in the tunnel, the fan assembly comprising:
a fan rotor for generating a ventilating flow, the inflow into the fan rotor being substantially parallel to the outflow from the fan rotor;
a nozzle throughbore having an edge which, in use, is in proximity to a surface of a surrounding tunnel in which the fan assembly is installed;
wherein:
the nozzle has a trailing edge at the distal end from the fan;
the fan assembly is arranged or arrangeable such that a ventilating flow generated by the fan will pass through the nozzle before exiting the assembly to enter a tunnel to be ventilated;
the angle made between the nozzle trailing edge and a centreline of the fan is not perpendicular;
the surface of the nozzle throughbore is non-cylindrical; and the nozzle throughbore edge is not arranged to direct the flow away from the surface of a surrounding tunnel when supplied air from the fan rotor.
[0007] Preferably, the nozzle throughbore edge is substantially parallel to the centreline of the fan.
[0008] Preferably the edge of the nozzle throughbore at the distal end from the fan forms a circle.
[0009] Preferably two nozzles are provided one installed on each side of the fan.
-3 [0010] Preferably the angle between the trailing edge and a line normal to the centreline of the fan is within the range of 5 to 60 degrees.
[0011] The invention provides a solution to the technical issue of how to turn the flow from a jetfan away from the surrounding tunnel surfaces and hence achieve greater in-tunnel aerodynamic thrust, without increasing the pressure drop through the jetfan.
[0012] The turning of the flow discharged into the tunnel is achieved through tilting the nozzle trailing edge. The jetfan is arranged with the longer side of the throughbore closer to the surrounding tunnel surface than the shorter side of the throughbore. The tilting of the nozzle trailing edge thus serves to turn the flow away from the surrounding tunnel surface.
[0013] Compared to GB2512181, this present invention allows for a larger crosssectional area through the throughbore, since the area is no longer restricted by an angled throughbore edge. In addition, smaller tilt angles can be selected for the inlet trailing edge, in order to reduce the likelihood and extent of any flow separation. The power consumption of the jetfan is thus significantly reduced.
[0014] Contrary to GB2512181, which teaches that the turning of the flow can only be achieved by angling of a throughbore edge, the present invention relies upon the tilting of the nozzle trailing edge. The Applicant’s Computational Fluid Dynamics calculations have confirmed that adequate turning of the flow into the tunnel can thereby be achieved.
[0015] The present invention has an advantage over GB2512181 in that any length of nozzle can be selected, to suit acoustic silencing requirements. The present invention is also simpler and cheaper to manufacture than GB2512181, because no angling of a throughbore edge is required. Less sheet metal is required for production of the present invention compared to GB2512181, because there is less in-plane curvature in the developed flat patterns.
-4[0016] Contrary to the teaching of JP-A-H1-237400, the present invention does not use a throughbore surface that is cylindrical in shape. This allows better matching of the nozzles to bellmouths.
[0017] By using trailing edges in the shape of a circle, circular bellmouths can be attached to the nozzle inlet. Such bellmouths can be readily manufactured using spinning production techniques.
[0018] The nozzles described in the invention can typically be used for acoustic silencing, as well as for turning the discharged flow away from the tunnel surrounding surfaces.
BRIEF DESCRIPTION OF THE DRAWINGS [0019] A number of preferred embodiments of the present invention will now be described by way of example only, and with reference to the accompanying drawings, in which:
[0020] Like reference numerals are used for like components throughout the figures;
[0021] Fig.l shows a vertical section through an embodiment of a ventilation apparatus with nozzles as described in this invention installed on both sides of a fan;
[0022] Fig. 2 shows an embodiment of a ventilation apparatus with a nozzle as described in this invention installed on one side of a fan;
[0023] Fig. 3 shows a horizontal section through an embodiment of a ventilation apparatus with nozzles as described in this invention installed on both sides of a fan; and
- 5 [0024] Fig. 4 shows an end view through an embodiment of a ventilation apparatus.
DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION [0025] Referring to Figure 1, this shows a sectional side view of an embodiment of the present invention within a bidirectional ventilation apparatus installed underneath a tunnel soffit, which is designed to operate in a fully reversible manner.
[0026] In this embodiment, a fan assembly comprising a fan rotor (3) driven by a motor (4) is installed within a fan housing (2). The fan rotor (3) is mounted along the fan centreline (7).
[0027] Airflow (5) enters the fan rotor (3) through a bellmouth (1) and an inlet nozzle throughbore (8), before being discharged thorough an outlet nozzle throughbore (9). The inlet and outlet trailing edges of the nozzle (6) are tilted at an angle (13) with respect to the normal to the fan centreline (7).
[0028] Preferably, the angle (13) is between 5 degrees and 60 degrees. Preferably still, the angle (13) is approximately 15 degrees.
[0029] A larger geometric throat (14) can be arranged at both the inlet and discharge sides of the nozzle, by tilting the nozzle trailing edge (6) by the angle (13) between the normal to the throughbore (14) and the trailing edge (6). The trailing edge (6) can thereby increase in length.
[0030] We refer now to Figure 2, which shows a side view of a particular embodiment of this invention which would normally (but not exclusively) be operated in a unidirectional manner.
[0031] In this embodiment, the indicated airflow direction is from left to right, i.e. the airflow (5) enters into a conventional nozzle (16) first, prior to being accelerated by the fan rotor (3) into a shaped nozzle with an outlet throughbore (9). The
-6discharged flow is turned by nozzle trailing edge (6) which is tilted with respect to the normal to the fan centreline (7) by an angle (13), such that in use, the discharged air flows away from the surrounding tunnel surfaces.
[0032] In Figure 2, the flow direction can if necessary be reversed by running the fan rotor in the opposite direction. Due to the increased Coanda effect, a reduction of the in-tunnel aerodynamic thrust can be expected in the reverse flow direction (i.e. from right to left) in the embodiment described in Fig. 2.
[0033] Referring now to Figure 3, which shows a horizontal sectional view of an embodiment of this invention, it can be seen that the sidewalls of the throughbore diverge at an angle (15) with respect to lines parallel to the fan centreline (7). This underlines the non-cylindrical nature of the throughbore surface, and highlights the increase in flow area at the inlet and outlet planes (14).
[0034] Fig. 4 shows an end view through an embodiment of a ventilation apparatus, with the edge of the nozzle throughbore at the distal end from the fan in the form of a circle with a specified diameter (17).
[0035] It would be possible to modify an existing fan assembly in order to fit nozzles as described in this invention to one or more sides of a fan, and hence reap the benefits of improved performance.
[0036] It will be appreciated that the foregoing are merely an examples of embodiments and just some examples of their use. The skilled reader will readily understand that modifications can be made thereto without departing from the true scope of the inventions.
Claims (5)
1. A fan assembly for installation in a tunnel to provide ventilation in the tunnel, the fan assembly comprising:
a fan rotor for generating a ventilating flow, the inflow into the fan rotor being substantially parallel to the outflow from the fan rotor;
a nozzle throughbore having an edge which, in use, is in proximity to a surface of a surrounding tunnel in which the fan assembly is installed; wherein:
the nozzle has a trailing edge at the distal end from the fan;
the fan assembly is arranged or arrangeable such that a ventilating flow generated by the fan will pass through the nozzle before exiting the assembly to enter a tunnel to be ventilated;
the angle made between the nozzle trailing edge and a centreline of the fan is not perpendicular;
the surface of the nozzle throughbore is non-cylindrical; and the nozzle throughbore edge is not arranged to direct the flow away from the surface of a surrounding tunnel when supplied air from the fan rotor.
2. A fan assembly according to claim 1, wherein the nozzle throughbore edge is parallel to the centreline of the fan.
3. A fan assembly according to claim 1 or claim 2, wherein the edge of the nozzle throughbore at the distal end from the each fan forms a circle.
4. A fan assembly according to any one of claims 1 to 3, having a nozzle installed on each side of a fan.
- 8
5. A fan assembly according to any one of claims 1 to 4, wherein the angle between the trailing edge and a line normal to the fan centreline is within the range of 5 to 60 degrees.
Intellectual
Property
Office
Application No: Claims searched:
GB1707147.3
1-5
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1707147.3A GB2562091A (en) | 2017-05-04 | 2017-05-04 | Optimised tunnel ventilation device |
| PCT/GB2018/000029 WO2018203023A1 (en) | 2017-05-04 | 2018-02-21 | Optimised tunnel ventilation device |
| US16/608,943 US11655712B2 (en) | 2017-05-04 | 2018-02-21 | Optimised tunnel ventilation device |
| AU2018263370A AU2018263370B2 (en) | 2017-05-04 | 2018-02-21 | Optimised tunnel ventilation device |
| JP2019548899A JP7276857B2 (en) | 2017-05-04 | 2018-02-21 | Optimized tunnel ventilation device |
| KR1020197030636A KR20200003792A (en) | 2017-05-04 | 2018-02-21 | Optimized tunnel ventilation |
| CN201880021742.9A CN110741166A (en) | 2017-05-04 | 2018-02-21 | Optimized tunnel ventilation device |
| EP18714336.7A EP3619435A1 (en) | 2017-05-04 | 2018-02-21 | Optimised tunnel ventilation device |
| CA3057405A CA3057405C (en) | 2017-05-04 | 2018-02-21 | Optimised tunnel ventilation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1707147.3A GB2562091A (en) | 2017-05-04 | 2017-05-04 | Optimised tunnel ventilation device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201707147D0 GB201707147D0 (en) | 2017-06-21 |
| GB2562091A true GB2562091A (en) | 2018-11-07 |
Family
ID=59065445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1707147.3A Withdrawn GB2562091A (en) | 2017-05-04 | 2017-05-04 | Optimised tunnel ventilation device |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2562091A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111059068A (en) * | 2019-12-11 | 2020-04-24 | 深圳市创智联环保设备有限公司 | Bidirectional jet fan with adjustable air inlet and outlet angles |
| WO2022079316A1 (en) | 2020-10-16 | 2022-04-21 | Mosen Ltd | Aerodynamic spolier for jetfan bellmouth |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01237400A (en) * | 1988-03-18 | 1989-09-21 | Hitachi Ltd | Reversable axial flow air blower |
| GB2509928A (en) * | 2013-01-17 | 2014-07-23 | Mosen Ltd | Tunnel ventilation fan and nozzle assembly |
-
2017
- 2017-05-04 GB GB1707147.3A patent/GB2562091A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01237400A (en) * | 1988-03-18 | 1989-09-21 | Hitachi Ltd | Reversable axial flow air blower |
| GB2509928A (en) * | 2013-01-17 | 2014-07-23 | Mosen Ltd | Tunnel ventilation fan and nozzle assembly |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111059068A (en) * | 2019-12-11 | 2020-04-24 | 深圳市创智联环保设备有限公司 | Bidirectional jet fan with adjustable air inlet and outlet angles |
| CN111059068B (en) * | 2019-12-11 | 2020-11-24 | 英飞同仁风机股份有限公司 | Bidirectional jet fan with adjustable air inlet and outlet angles |
| WO2022079316A1 (en) | 2020-10-16 | 2022-04-21 | Mosen Ltd | Aerodynamic spolier for jetfan bellmouth |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201707147D0 (en) | 2017-06-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |