Water tunnel test device and method for circulating water system

Abstract

A circulating water system water tunnel test device provided by the present invention comprises a test object, a guarantee water pump, a guarantee pipeline, a water storage tank and a rectangular test section, the test object is fixedly installed on the rectangular test section and is communicated with the interior of the rectangular test section, one end of the rectangular test section leads to the water storage tank, and the other end of the rectangular test section is communicated with the guarantee pipeline through a special-shaped pipe. According to the device, the test time is short, the requirement for the area of the water pool is low, the relative motion principle can be utilized, a test object is made to be static, the water flow velocity is guaranteed, and the navigational speed is simulated; the actual operation state of the circulating water system in the ship running process in the marine environment can be simulated, data of the internal flow characteristics of the test object are obtained, and it is determined that cooling water provided by the actual circulating water system can meet the requirements of equipment such as a condenser.

Description

Technical Field

[0001] The invention belongs to the technical field of ship circulating water system testing, and in particular relates to a circulating water system water tunnel testing device and method. Background Art

[0002] Modern ships often use circulating water systems to provide cooling water for condensers and other equipment. The circulating water system includes seaports, water pumps, valves and other piping accessories, etc., which can meet the cooling water demand under some operating conditions through gravity, so that the circulating water pump is only started under some operating conditions, reducing the size and weight of the equipment and improving the operating efficiency and reliability of the system.

[0003] For the newly developed circulating water system, there is a lack of internal flow characteristics data, and it is impossible to determine whether the cooling water it provides can meet the needs of equipment such as condensers. In the past, the flow characteristics test of the circulating water system was usually carried out by dragging the test object, but in order to simulate the actual speed and to obtain sufficient test data, dragging the test object takes a long time and requires a high pool area. It is difficult to find such test conditions in China. Summary of the invention

[0004] In order to solve the above problems of the prior art, an embodiment of the present invention provides a water tunnel test device and method for a circulating water system.

[0005] According to one aspect of the present invention, there is provided a water tunnel test device for a circulating water system, comprising a test object, a protection water pump, a protection pipe, a water reservoir and a rectangular test section, wherein the test object is fixedly mounted on the rectangular test section and is connected to the interior of the rectangular test section, one end of the rectangular test section leads to the water reservoir, and the other end is connected to the protection pipe via a special-shaped pipe, the protection water pump is installed on the protection pipe, and the other end of the protection pipe is connected to the water reservoir.

[0006] Preferably, a regulating valve, a pressure sensor and a non-contact flow sensor are installed on the test object, the pressure sensor is installed at the inlet and outlet of the test object, the regulating valve is used to control the flow resistance in the test object, and the non-contact flow sensor is used to measure the flow through the test object.

[0007] Preferably, the width of the rectangular test section is 3 times the width of the sea estuary, and the height is 2 times the height of the sea estuary.

[0008] Preferably, a vent hole is provided at the highest point of the test object, and the vent hole is blocked by a bolt.

[0009] Preferably, before the test, the water level of the water reservoir is higher than the highest point of the test object.

[0010] The present invention also provides a water tunnel test method for a circulating water system, comprising the following steps:

[0011] S1. Before the test, turn on the support water pump and make it run at a low speed. At the same time, open the vent hole, then fill water into the water tank so that the water level of the water tank is higher than the highest point of the test object. The water in the water tank enters the test object through the vent hole. After the test object is filled with water, use bolts to seal the vent hole.

[0012] S2. Adjust the power and speed of the water pump to make the water flow rate in the rectangular test section reach the speed corresponding to the test condition, obtain the inlet and outlet pressures of the test object through the pressure sensor, and adjust the opening of the regulating valve to make the resistance of the test object reach the resistance value corresponding to the test condition;

[0013] S3. After running for 15 minutes, record the flow rate of the water pump, the inlet and outlet pressures of the test object, and the flow rate of the test object.

[0014] The beneficial effects brought by the present invention are as follows:

[0015] It can be seen from the above scheme that the embodiment of the present invention provides a water tunnel test device and method for a circulating water system, which not only has a short test time and low requirements for the water tank area, but also can use the principle of relative motion to make the test object stationary and ensure that the water flow rate simulates the ship speed, thereby simulating the actual operating state of the circulating water system during the ship's navigation in the marine environment. In this way, not only the gravity flow rate of the circulating water system at different speeds can be obtained, but also the resistance characteristics of the circulating water system can be analyzed to obtain the head required to be provided by the circulating water pump, thereby eliminating the risk of the circulating water system on board the ship, and according to the data of the internal flow characteristics of the test object obtained in the test, it is determined that the cooling water provided by the actual circulating water system can meet the needs of equipment such as the condenser. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram showing a water tunnel test device for a circulating water system according to an embodiment of the present invention;

[0017] Figure 2 A side view of a test subject showing an embodiment of the present invention;

[0018] Figure 3 A top view of a test subject according to an embodiment of the present invention is shown.

[0019] In the figure, 1 is the test object; 2 is the protection water pump; 3 is the protection pipeline; 4 is the water storage tank; 5 is the rectangular test section; 6 is the special-shaped pipe; 7 is the regulating valve; 8 is the pressure sensor; and 9 is the non-contact flow sensor. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example

[0022] like Figures 1 to 3 As shown, the present invention provides a water tunnel test device for a circulating water system, comprising a test object 1, a protection water pump 2, a protection pipeline 3, a water storage tank 4 and a rectangular test section 5, wherein the test object 1 is a circulating water system model, the inlet and outlet structures of the circulating water system model are consistent with the actual circulating water system, and the size satisfies a similar proportional relationship with the size of the actual circulating water system, the test object 1 is fixedly mounted on the rectangular test section 5 by welding, and is connected to the interior of the rectangular test section 5, one end of the rectangular test section 5 leads to the water storage tank 4, and the other end is connected to the protection pipeline 3 through a special-shaped pipe 6, the protection water pump 2 is installed on the protection pipeline 3, and the other end of the protection pipeline 3 is connected to the water storage tank 4.

[0023] Furthermore, the test object 1 is installed with a regulating valve 7, a pressure sensor 8 and a non-contact flow sensor 9. The pressure sensor 8 is installed at the inlet and outlet of the test object 1. The pressure sensor 8 is used to measure the inlet and outlet pressures of the test object 1 to obtain the resistance of the test object 1; the regulating valve 7 is used to control the flow resistance in the test object 1; and the non-contact flow sensor 9 is used to measure the flow through the test object 1. The actual circulating water system includes equipment such as pipes, condensers, gate valves, and circulating water pumps. Since the test only focuses on the flow resistance characteristics, the resistance of the above equipment can be simulated by the regulating valve 7, and the flow resistance can be controlled by the opening of the regulating valve 7. Therefore, only the regulating valve 7 needs to be installed to simulate the resistance of the above equipment. The test process is simple and easy to operate.

[0024] Furthermore, the upper wall of the rectangular test section 5 simulates the outer hull plate of the hull, the width of the rectangular test section 5 is 3 times the width of the sea estuary, and the height is 2 times the height of the sea estuary. The width and height of the rectangular test section 5 are large enough to eliminate the influence of the two side walls and the bottom boundary layer of the rectangular section on the gravity flow of the circulating water system model.

[0025] Furthermore, a vent hole is provided at the highest point of the test object 1, and the vent hole is blocked by a bolt.

[0026] Furthermore, before the test, the water level of the water tank 4 is higher than the highest point of the test object 1 .

[0027] Furthermore, the support water pump 2, the support pipe 3 and the water storage tank 4 provide support water with a certain flow rate for the water tunnel, i.e., the rectangular test section 5. By adjusting the rotation speed and power of the support water pump 2, the test object 1 is provided with incoming flow with different flow rates to simulate different navigation speeds. The flow rate can be changed according to the needs of the test conditions.

[0028] A water tunnel test method for a circulating water system, characterized in that it comprises the following steps:

[0029] S1. Before the test, turn on the water pump 2 to make it run at a low speed, open the vent hole at the same time, and then fill water into the water tank 4 so that the water level of the water tank 4 is higher than the highest point of the test object 1. The water in the water tank 4 enters the test object 1 through the vent hole. After the test object 1 is filled with water, use bolts to block the vent hole;

[0030] S2. Adjust the power and speed of the water pump 2 so that the water flow rate in the rectangular test section 5 reaches the speed corresponding to the test condition, obtain the inlet and outlet pressures of the test object 1, that is, the resistance of the test object 1, through the pressure sensor 8, and adjust the opening of the regulating valve 7 so that the resistance of the test object 1 reaches the resistance value corresponding to the test condition;

[0031] S3. After running for 15 minutes, record the flow rate of the water pump 2, the inlet and outlet pressures of the test object 1, and the flow rate of the test object 1;

[0032] S4. After the test is completed, by changing the power and speed of the water pump 2, the flow rate of the water pump 2, the inlet and outlet pressures of the test object 1, and the flow rate of the test object 1 under different test conditions are measured in turn.

[0033] The present invention has the following beneficial effects:

[0034] (1) This test method is based on the principle of relative motion and uses a water tunnel to make the test object stationary. It has low requirements for test support conditions and is easy to implement.

[0035] (2) The flow resistance of the circulating water pump, condenser, gate valve and other equipment in the actual circulating water system is simulated by the regulating valve, and can be easily adjusted according to the test conditions, simplifying the test system.

[0036] (3) This test method can be used not only to study the system gravity flow and flow resistance characteristics under different equipment resistance characteristics and different ship speeds, but also to study the mutual influence between the two sea outlets of the circulating water system.

[0037] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A water tunnel test device for a circulating water system, characterized in that: The invention comprises a test object (1), a protection water pump (2), a protection pipe (3), a water tank (4) and a rectangular test section (5); the test object (1) is fixedly mounted on the rectangular test section (5) and is connected to the interior of the rectangular test section (5); one end of the rectangular test section (5) leads to the water tank (4), and the other end is connected to the protection pipe (3) through a special-shaped pipe (6); the protection water pump (2) is mounted on the protection pipe (3), and the other end of the protection pipe (3) is connected to the water tank (4).

2. The water tunnel test device for a circulating water system according to claim 1, characterized in that: The test object (1) is installed with a regulating valve (7), a pressure sensor (8) and a non-contact flow sensor (9); the pressure sensor (8) is installed at the inlet and outlet of the test object (1); the regulating valve (7) is used to control the flow resistance in the test object (1); and the non-contact flow sensor (9) is used to measure the flow rate through the test object (1).

3. The water tunnel test device for a circulating water system according to claim 1, characterized in that: The width of the rectangular test section (5) is 3 times the width of the sea estuary, and the height is 2 times the height of the sea estuary.

4. The water tunnel test device for a circulating water system according to claim 1, characterized in that: An exhaust hole is provided at the highest point of the test object (1), and the exhaust hole is blocked by a bolt.

5. The water tunnel test device for a circulating water system according to claim 1, characterized in that: Before the test, the water level of the water reservoir (4) is higher than the highest point of the test object (1).

6. A water tunnel test method for a circulating water system, characterized in that: The steps include: S1. Before the test, the water pump (2) is turned on to run at a low speed, and the vent is opened at the same time. Then, water is poured into the water tank (4) so ​​that the water level of the water tank (4) is higher than the highest point of the test object (1). The water in the water tank (4) enters the test object (1) through the vent. After the test object (1) is filled with water, the vent is sealed with bolts. S2, adjusting the power and rotation speed of the water pump (2) so that the water flow rate in the rectangular test section (5) reaches the speed corresponding to the test condition, obtaining the inlet and outlet pressures of the test object (1) through the pressure sensor (8), and adjusting the opening of the regulating valve (7) so that the resistance of the test object (1) reaches the resistance value corresponding to the test condition; S3. After running for 15 minutes, record the flow rate of the water pump (2), the inlet and outlet pressures of the test object (1), and the flow rate of the test object (1).

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