CN107662695B - Other-hidden and self-hidden utilization method for ship main engine tail gas - Google Patents
Other-hidden and self-hidden utilization method for ship main engine tail gas Download PDFInfo
- Publication number
- CN107662695B CN107662695B CN201610594588.7A CN201610594588A CN107662695B CN 107662695 B CN107662695 B CN 107662695B CN 201610594588 A CN201610594588 A CN 201610594588A CN 107662695 B CN107662695 B CN 107662695B
- Authority
- CN
- China
- Prior art keywords
- tail gas
- bubbles
- wake
- ship
- bubble
- 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.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/32—Arrangements of propulsion power-unit exhaust uptakes; Funnels peculiar to vessels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
- B63G13/00—Other offensive or defensive arrangements on vessels; Vessels characterised thereby
- B63G13/02—Camouflage
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
An invisible and self-invisible tail gas utilization method for a main engine of a ship belongs to the application field of ship stealth and tail gas recycling technology. The technology creatively provides that the quantity of wake bubbles is suppressed by utilizing the tail gas discharged by a large amount of ships, the tail gas discharged by a main machine is treated and then discharged underwater, and the infrared and visual stealth of the high-temperature tail gas can be realized. And a large amount of large bubbles discharged by tail gas can be utilized to generate effective interference on the bubbles of the wake flow of the ship through the coalescence, carrying and neutralization effects with the microbubbles of the wake flow, the microbubbles in the wake flow are continuously captured and attracted to overcome the obstruction of turbulent flow by large buoyancy, and the microbubbles quickly float out of the water surface to achieve the effect of eliminating the wake flow. The method reduces the space occupation of the ship and has small change to the structure of the ship. The method is closer to practical use, and is the simplest and direct means for eliminating wake bubbles. Provides a more convenient way for really realizing the application of the new technology of the bubble wake suppression of the ships. The technology can fundamentally eliminate the wake bubble of the ship, has the advantages of rapid starting, flexible structural arrangement and the like, and can be just used as the technology for eliminating the wake of the tail gas of the main engine of the ship.
Description
Technical Field
The invention relates to an invisible and self-invisible tail gas utilization method for a main engine of a ship, and belongs to the application field of ship stealth and main engine tail gas recycling technology.
Background
The range of the ship wake flow is large, the duration is long, and the ship wake flow is not easy to eliminate and disguise. In addition, more than ten physical fields including bubble fields, microwave, infrared, acoustic and optical fields, and the like exist in the ship wake flow, and cannot be eliminated in a short time. For military operations, the acquisition of the ship trail information plays a crucial role, because a single ship target is easy to disguise, but the trail with a large spatial range is difficult to avoid. The wake flow self-guiding torpedo is mainly based on optical signals, magnetic signals, thermal signals, radioactive signals, bubble field signals and the like of wake flow. In the existing research, the bubble field is the most easily found out of many physical fields and is the wake physical field most utilized by the self-guided torpedo. In the surface layer of the seawater, micro bubbles can be sucked into vortexes formed by a turbulent flow boundary layer and propellers, the vortexes are greatly influenced and long in duration, so that the bubbles are kept in the water for a longer time, and the detected and utilized distance is longer. This poses a serious threat to the surface safety of ships. Aiming at the hidden scheme of the bubble wake field, research is actively carried out in all countries. At present, the anti-wake self-guiding torpedo technology at home and abroad mainly comprises three types of hard killing resistance, soft killing resistance and non-killing resistance. The effective exertion of the hard killer weapon depends on timely and accurate judgment of the incoming torpedo, but no mature technology can complete effective detection and identification of the torpedo at present. Although the soft killer countermeasure technology is widely used, the countermeasure effect is reduced due to the increase of the intelligence of the torpedo. The non-destructive weapon mainly comprises a ship wake stealth technology. Wake stealth is a subject of a relatively new frontier. Wherein wake bubble field stealth technology is particularly important.
Although the existing ship bubble field stealth technology can well reduce the density of bubbles in wake, the inherent problems of the existing technology limit the application of the bubble field wake stealth technology in the military field. Several wake defoaming technologies with better effect at present: the key problems of military application of technologies such as an ultrasonic defoaming method, a defoaming agent releasing method, an artificial large bubble defoaming method, a wake energy absorption method and the like are as follows: the ultrasonic wave, the special defoaming agent, the artificial large bubbles and the like are uniformly and continuously discharged within a certain width range below the primary bubble wake of the ship so as to achieve the purpose of wake elimination. The ship is transformed to a greater extent, the space occupation is large, the arrangement is difficult, the maneuverability of the ship is not facilitated, the defects of high energy consumption, high cost and the like exist to different extents, and the feasibility of the ship is to be tested.
In the working process of diesel engines, gas turbines and steam turbines in the power main machines of ships, the discharged tail gas has the characteristics of large discharge capacity, high temperature, complex components, more harmful substances and the like. Harmful gas pollutants in the exhaust gas have serious harm to human health and environment. And the dry smoke discharging mode of direct aerial discharge through the pipeline can lead the discharged waste gas to be sucked into the cabin due to the influence of disturbance airflow, and can cause pollution, corrosion and the like to the superstructure, the working cabin and the living cabin of the ship. The exhaust gas can reach 400-600 ℃, and the exhaust area is large, thereby being the largest infrared radiation source of ships. Smoke components in tail gas become visual signals in the sailing process of ships, enemies can track tracks by means of smoke emission, and a large amount of discharged smoke is difficult to hide. The radar can find the target, detect, track and attack. The ship tail gas emission hazard does not meet the current strict emission control regulation and the requirements for guaranteeing the vitality of ships.
Disclosure of Invention
The ship bubble field stealth technology is a technical measure for reducing the characteristic strength of wake bubble signals of surface ships, so that discovery, identification, tracking, positioning and attack by other platforms and weapon detection systems are reduced. The naval vessel adopts the bubble field stealth technology, and has important significance for improving the viability and the fighting capacity.
The essence that the ship wake field can be detected and utilized is a large amount of tiny bubbles in the ship wake field, so the core problem of the technology for inhibiting the ship bubble wake flow is how to effectively reduce the number density of bubbles in the ship wake field, so that the bubbles have no obvious difference compared with the surrounding common water area, and cannot be detected.
Aims to reduce the defects of reconstruction of naval vessels, high energy consumption and the like and eliminate the tail gas emission hazard of naval vessels. The invention creatively provides a ship host tail gas stealth and self-stealth utilization method, on one hand, the tail gas of the host is utilized to eliminate the ship wake bubbles and realize wake stealth; on the other hand, the infrared and the smoke trace of the tail gas are hidden.
The hidden and self-hidden utilization technology of the tail gas of the main engine of the ship is the simplest and direct means for eliminating the wake flow bubbles by using local materials of the tail gas. The technique discharges tail gas discharged by a main engine directly or after moderate pressurization treatment by underwater, thereby: on one hand, a large amount of bubbles discharged by tail gas can be utilized to continuously and efficiently capture and attract tiny bubbles in the wake flow through the coalescence, carrying and neutralization with wake flow micro bubbles, so that the bubble wake flow field of the ship can be quickly restrained, and the purpose of hiding the wake flow can be realized; on the other hand, the high-temperature tail gas of the main engine can be rapidly cooled by utilizing seawater, the infrared stealth purpose is realized, the problem of visible smoke trace exposure in the space around the ship is fundamentally eliminated, and the environment pollution is reduced.
The technology can fundamentally eliminate the wake bubble of the ship, has the advantages of rapid starting, flexible structural arrangement, small occupied space of the ship, small change on the structure of the ship and the like, is closer to practical use, and provides a more direct and more convenient way for truly realizing the engineering application of the new technology of restraining the bubble wake of the ship. Has good application prospect.
The method comprises the following steps:
A. arranging a tail gas discharge device at the tail part of the ship;
B. the tail gas of the main engine of the ship is exhausted through the exhaust device, a large amount of tail gas bubbles are formed below the wake flow of the ship, and the micro bubbles in the wake flow can be quickly eliminated.
The method is suitable for all ships with power main machines of diesel engines, gas turbines and steam turbines.
In the step A, the tail gas is directly or moderately pressurized and then discharged to meet the requirement of exhaust back pressure.
And B, in the step A, the tail end of the exhaust device is provided with a plurality of gas injection holes, and the tail gas bubble group can completely cover the wake flow bubble area by controlling the supercharging device or the discharge angle.
In the floating process, the tail gas big bubbles can generate carrying, coalescence, neutralization and other effects with wake micro bubbles, so that the retention time of a bubble wake field is greatly shortened, and the wake micro bubbles quickly float to the water surface to be broken or dissolved and disappear. Effectively eliminating wake micro-bubbles to enhance wake stealth effect.
The contact area of tail gas bubbles and seawater is effectively increased, so that high-temperature tail gas is cooled at an accelerated speed, a superheat area generated by the tail gas is eliminated, the infrared signal characteristic of a naval vessel is reduced, and the infrared stealth effect is enhanced.
The weak alkaline low-temperature seawater absorbs more nitrogen oxides NO in the high-temperature tail gasXSulfide SOX、CO2And harmful substances such as soot and the like, and has obvious effects of eliminating the ship smoke trail and protecting the environment.
The working principle of the technical scheme is as follows:
firstly, in the course of ship navigation, there is a lot of tail gas emissions. Compared with wake micro bubbles, the tail gas large bubbles in the turbulent flow field are easier to break loose from the control of the flow field, and the floating is accelerated.
And secondly, the tail gas bubbles can carry surface layer stern trail micro bubbles to do accelerated floating motion in the floating process. Due to the action of viscosity, the floating process of the large bubbles in water inevitably drives the water body in a certain range around the large bubbles to move upwards, when the dense large bubble groups float upwards together, the induced speed of each large bubble on the water body is mutually overlapped, an upwash is inevitably formed, and the wake bubbles inevitably float quickly under the carrying of the upwash, so that the retention time of the bubble wake field is greatly shortened. And the tail gas bubbles can accelerate floating up due to larger momentum, thereby increasing the carrying effect on wake micro bubbles.
And thirdly, when the big tail gas bubbles meet or collide with the tail flow micro-bubbles, the big tail gas bubbles are combined to form a big bubble under the action of a dynamic mechanism. Namely, the coalescence of the micro bubbles is realized in the process of carrying surface stern trail bubbles by the big tail gas bubbles, and finally, the big tail gas bubbles quickly float to the water surface to be broken or dissolved and disappear. The coalescence of bubbles can be divided into three processes: liquid film forming process, liquid film falling process and liquid film breaking process. The liquid layer that forms between the bubble is at the in-process of contact collision, because the influence of multiple additional effort, makes this liquid layer constantly drop the attenuation, if thickness reduces to critical thickness, can take place to break, and two bubbles fuse into one, realize gathering of bubble. Solid particles in the tail gas can accelerate the coalescence of bubbles. The tail gas bubbles can absorb wake micro bubbles more easily, so that the coalescence time is reduced, and the wake disappearance time is accelerated.
Fourthly, the component with high content in the seawater is Na+，Mg+，Ca2+，Cl-，SO4 2-And the quantity of strong alkali ions in the seawater is more than that of strong acid ions, so that the seawater has weak alkaline characteristics, and the pH value range is 7.5-8.6. And nitrogen oxides (nitric acid, NO) in the tail gas of the main engine2Etc.), Sulfides (SO)2、SO3Etc.) so that the original weak alkaline seawater environment around the wake bubbles is obviously changed and even can reach strong acidity, and the neutralization reaction between the tail gas big bubbles and the wake microbubbles is helpful to reduce the acting force of thinning a liquid film when the bubbles are converged and accelerate the disappearance of the bubbles, thereby being not beneficial to the survival of the original wake microbubbles.
Fifthly, high-temperature tail gas is discharged underwater, harmful components in the tail gas are fully fused with seawater because aerial discharge is not directly carried out, and the amount of the high-temperature tail gas on the sea surface is reduced. Firstly, a superheat zone generated by high-temperature tail gas can be eliminated, the infrared signal characteristic of the naval vessel is reduced, and the infrared stealth of the naval vessel is enhanced; secondly, due to the greatly reduced visible smoke signals in the navigation process, the ship can effectively conceal the smoke traces; and thirdly, the pollution of harmful gas to the environment and the ship cabin can be effectively reduced.
The invention has the beneficial effects that: a method for utilizing tail gas of host machine of ship by hiding and self hiding features that the traditional technique for eliminating tail flow is improved, and the tail gas of host machine is big, high in floating speed and acidic. The tail gas of the main engine of the ship is directly or moderately treated and then discharged underwater, the breaking and disappearance of micro bubbles of the wake flow can be accelerated, the purpose of eliminating the wake flow is achieved, the navigation safety of infrared stealth, visible stealth of smoke and the like of the ship is enhanced, and meanwhile, the discharge hazard of tail gas pollution and the like is reduced. The technology has the defoaming effect on the basis of not excessively depending on external energy and additional equipment, and has the effect on the quantity of wake flow bubbles in various ranges, so that the aims of efficiently eliminating the wake flow and various stealths are fulfilled, and the sailing safety of ships can be effectively improved. The method is very convenient to use, is convenient to arrange at the tail part of the ship and has good application prospect.
Drawings
FIG. 1 is a schematic view of a tail gas elimination wake flow device of a main engine.
Detailed Description
1. The tail part of the ship is provided with a tail gas discharge device. When the tail gas is discharged, whether a supercharging device is additionally arranged can be selected according to the requirement of the exhaust back pressure of the main engine.
2. The tail gas of the main engine of the ship is exhausted through the exhaust device, a large amount of tail gas bubbles are formed below the wake flow of the ship, and the micro bubbles in the wake flow can be quickly eliminated.
3. The tail end of the exhaust device is provided with a plurality of air injection holes, and the tail gas bubble group can completely cover the wake flow bubble area by controlling the pressurizing device or the discharge angle.
Claims (1)
1. An other hidden and self-hidden utilization method of the tail gas of a main engine of a ship; the method comprises the following steps:
A. arranging a tail gas discharge device at the tail part of the ship;
B. the tail gas of the main engine of the ship is exhausted through the exhaust device, and a large amount of micro bubbles in the wake flow can be quickly eliminated by tail gas bubbles formed below the wake flow of the ship;
in the step A, tail gas is directly or moderately pressurized and then discharged to meet the requirement of exhaust back pressure of a host;
in the step A, the tail end of the discharge device is provided with a plurality of gas injection holes, and the tail gas bubble group can completely cover a wake flow bubble area by controlling the supercharging device or the discharge angle;
the method is suitable for all ships with diesel engines, gas turbines and steam turbines as main machines;
in the floating process of the tail gas big bubbles, the tail gas big bubbles can generate carrying, coalescence and neutralization effects with wake micro bubbles, so that the retention time of a bubble wake field is greatly shortened, the wake micro bubbles quickly float to the water surface to be broken or dissolved and disappear, and wake micro bubbles are effectively eliminated to ensure the wake stealth effect;
when the tail gas big bubbles meet or collide with wake micro bubbles, the tail gas big bubbles are combined under the action of a dynamic mechanism to form a big bubble, namely the tail gas big bubbles realize coalescence of the micro bubbles in the process of carrying surface stern trail bubbles, and finally realize quick floating together until the micro bubbles are broken or dissolved and disappear;
the coalescence of bubbles is divided into three processes: the liquid film forming process, the liquid film falling process and the liquid film breaking process are adopted, the liquid layer formed among the bubbles continuously falls and becomes thin due to the influence of various additional acting forces in the contact collision process, if the thickness is reduced to critical thickness, the liquid layer can break, the two bubbles are fused into a whole, the coalescence of the bubbles is realized, and the coalescence of the bubbles is accelerated by solid particles in tail gas;
the contact area of tail gas bubbles and seawater is effectively increased, so that high-temperature tail gas is cooled in an accelerated manner, an overheated area generated by the tail gas is eliminated, the infrared signal characteristics of the naval vessel are reduced, and the infrared stealth effect is enhanced;
the weak alkaline low-temperature seawater absorbs more nitrogen oxides NO in the high-temperature tail gasXSulfide SOX、CO2And carbon smoke harmful substances, and has obvious effects of eliminating smoke traces of ships and protecting the environment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610594588.7A CN107662695B (en) | 2016-07-27 | 2016-07-27 | Other-hidden and self-hidden utilization method for ship main engine tail gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610594588.7A CN107662695B (en) | 2016-07-27 | 2016-07-27 | Other-hidden and self-hidden utilization method for ship main engine tail gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107662695A CN107662695A (en) | 2018-02-06 |
| CN107662695B true CN107662695B (en) | 2022-04-01 |
Family
ID=61114435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610594588.7A Active CN107662695B (en) | 2016-07-27 | 2016-07-27 | Other-hidden and self-hidden utilization method for ship main engine tail gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107662695B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109334857B (en) * | 2018-10-26 | 2024-04-12 | 中国船舶重工集团公司第七一九研究所 | Bubble wake flow reduction device for water surface ship |
| CN112973383A (en) * | 2019-12-14 | 2021-06-18 | 中国科学院大连化学物理研究所 | Underwater fuel cell tail gas discharge system |
| CN112730308B (en) * | 2021-01-04 | 2022-11-22 | 东风汽车股份有限公司 | Device and method for testing tail gas components of whole vehicle |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1150571A (en) * | 1995-10-12 | 1997-05-28 | 武汉市武昌科力工程技术公司 | Infrared stealth exhaust system for main engine of medium and high-speed ship |
| US5700172A (en) * | 1996-01-18 | 1997-12-23 | Ray Industries, Inc. | Submerged marine exhaust system |
| US5820426A (en) * | 1997-02-21 | 1998-10-13 | Brunswick Corporation | Exhaust system for personal watercraft |
| DE19723997B4 (en) * | 1997-06-06 | 2005-11-03 | Blohm + Voss Gmbh | Exhaust system for seagoing vessels, preferably for military purposes |
| US6010380A (en) * | 1999-08-09 | 2000-01-04 | Wollard; Donald L. | Marine exhaust vented forward of propeller hub |
| US9180939B2 (en) * | 2008-01-17 | 2015-11-10 | Dale C. Barr | Systems and methods for watercraft having marine environment enhancement capability |
| WO2010107345A1 (en) * | 2009-03-20 | 2010-09-23 | Ab Volvo Penta | A method and system for controlling the exhaust gases from an engine |
| CN204514567U (en) * | 2015-04-09 | 2015-07-29 | 中国人民解放军91439部队 | A kind of Ship Bubbles Wake field laboratory simulation device |
-
2016
- 2016-07-27 CN CN201610594588.7A patent/CN107662695B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107662695A (en) | 2018-02-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107662695B (en) | Other-hidden and self-hidden utilization method for ship main engine tail gas | |
| CN202828057U (en) | Aircraft carrier capable of adjusting carried airplanes and submarines and warships manoeuvrably | |
| US20220340235A1 (en) | Method and device for reducing wave-making resistance and friction force during ship navigation | |
| CN105371710A (en) | Guided-missile high-speed water entering method based on reverse gas injection | |
| CN106005330A (en) | Invisible missile speedboat | |
| KR20090105312A (en) | Apparatus and method for deceiving wake-homing torpedoes | |
| Wu et al. | Research on the development of unmanned underwater system detection technology | |
| US8552282B1 (en) | Propulsion defeating system | |
| CN102963513B (en) | Foley submarine | |
| CN201400305Y (en) | Sailing mother ship of ship-based missile mosquito boat | |
| RU2397431C2 (en) | Method for protection of territorial waters and device for its realisation | |
| CN101544169A (en) | Variable navigation mode hydrofoil craft | |
| CN202743469U (en) | Voice simulation submarine | |
| CN2875946Y (en) | Diving hidden missile boat | |
| Pickrell | South Korean Warship runs afoul of China in the South China Sea as the US and its allies up the pressure on Beijing | |
| CN202609063U (en) | Unmanned submarine | |
| CN206269674U (en) | Water curtain dazzle system | |
| CN104108473B (en) | Exempt from runway multimachine with flying band submarine high speed aircraft carrier | |
| CN206231557U (en) | Naval vessel overtaking wave from blanking wave absorption air curtain device | |
| Qiu et al. | Numerical investigation and its application on the falling motion of freefall lifeboat | |
| CN105882926A (en) | Unmanned submarine vehicle for simulating real submarine noise to disturb enemy monitoring | |
| CN203937851U (en) | Oil electricity hybrid propulsion engine installation based on unmanned oceanic sounding ship | |
| CN102168936A (en) | Navigation device capturing system | |
| Jun et al. | A Experimental Study on the Effect of Increasing Rudder Force on Turning Ability of Short Sea Shipping Ship | |
| CN212667626U (en) | Novel underwater acoustic experiment navigation device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhang Zhiyou Inventor after: Yuan Zhijiang Inventor after: Jiang Xiaogang Inventor after: Tian Hengdou Inventor after: Wang Yong Inventor after: Ai Wei Inventor after: Chen Mingrong Inventor after: Jin Liangan Inventor after: Chi Wei Inventor before: Jin Liangan Inventor before: Chi Wei Inventor before: Yuan Zhijiang Inventor before: Zhang Zhiyou Inventor before: Tian Hengdou Inventor before: Wang Yong Inventor before: Ai Wei Inventor before: Chen Mingrong Inventor before: Jiang Xiaogang |
|
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20201014 Address after: 116018 No. 667, Zhongshan, Dalian District, Liaoning, Jiefang Road Applicant after: PLA DALIAN NAVAL ACADEMY Address before: 116018 No. 667, Zhongshan, Dalian District, Liaoning, Jiefang Road Applicant before: Jin Liangan |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |