Cat 40 coolant inducer
A Cat 40 coolant inducer is a device used in the aerospace industry for cooling liquids used in aerospace engines. It is a type of heat exchanger where liquid from the heat source is pumped through tubes and is cooled by surrounding liquid. It is primarily used for water-based coolants in jet rcraft.
A typical Cat 40 cooling inducer consists of a tube bundle housing of aluminum, with the inlet and outlet tubes embedded inside. These are usually housed in a shell made of a light alloy, for example 6061 aluminium. The shell is usually perforated with a set of tubes and fins, to allow for better heat transfer. Each shell houses a cooling coil with cooling water which is forced over the tubes in a controlled manner using a pump. This coolant is usually water, but other fluids such as ammonia, carbon dioxide and hydrogen peroxide are also used. A typical design is shown in the diagram.
As can be seen, the coolant enters through the top, is forced through the tubes by the pump, and exits through the bottom. This action is used to cool the coolant which flows in the tubes. For high performance applications, there is a secondary cooling circuit which circulates cold water through the finned shell to cool the outer shell. This allows for greater cooling of the outer shell, and hence cooling of the entire inducer.
The inducer is mounted to the engine in such a way as to provide easy access for service operations. It is usually mounted to the engine casing, using bolts or screws. In the case of water based coolants, the coolant pump is mounted inside the engine, with the cooling coil housing outside the engine casing. In the case of ammonia based coolants, the coolant pump is mounted outside the engine, with the cooling coil housing inside the engine.
The most common type of inducer used in jet rcraft is the water-cooled Cat 40 inducer. This is commonly used for rcraft such as the Boeing 737, rbus 320, and rbus 340.
The Cat 40 cooling inducer is commonly used in rliners for water-based coolants. In most applications, it offers superior thermal properties to more common devices. For example, the water-cooled inducer allows the use of high-temperature materials such as nickel and titanium. The use of high-temperature materials allows for a greater range of temperatures that can be cooled. In the Boeing 737, the turbine can reach over, and is cooled by a water-based coolant. The coolant must be in contact with the r inside the engine, and so there is a need to remove the heat from the coolant as efficiently as possible. The Cat 40 cooling inducer allows the use of water as the coolant, which is an extremely efficient medium for cooling.
In applications where a higher pressure and a smaller mass flow rate are needed, the Cat 40 cooling inducer is commonly combined with an economizer. This is shown in the diagram. The mn coolant pump is used for cooling the engine, and the economizer pump is used to cool the coolant which flows through the Cat 40 inducer. The engine is connected to the inducer in such a way that the coolant flows from the engine to the Cat 40 inducer, then back to the engine. This allows the use of higher temperature engines, and the use of a larger coolant volume without affecting the pressure.
In the Boeing 737, the economizer pump is connected directly to the Cat 40 inducer. The cat cooler is mounted to the engine case and is connected to a manifold block which connects to the economizer pump. In the case of other applications, such as the rbus 320, the Cat 40 cooling inducer is connected to the fan inlet case and is connected to the economizer pump.
Another common use for Cat 40 cooling inducers is in applications where the flow of liquid is high, such as the Boeing 777 and rbus A340. In these applications, the inducer can be of the high-pressure type. The Cat 40 inducer is usually mounted to the engine casing in a similar way to water-cooled Cat 40s.
One of the more unusual uses for Cat 40 cooling inducers is the cooling of the fan inlet cases. In this application, a Cat 40 cooling inducer is mounted to the fan case, as shown in the diagram. Water is used as the coolant and is forced through the Cat 40 cooling inducer, where the heat is transferred to the water. The cooled water is then pumped to the radiator, where it cools the rcraft r.
The primary disadvantage of the Cat 40 cooling inducer is the size. For the application described above, a typical inducer would have an inlet diameter of about 1.5 metres. This size makes it unsuitable for use in small rcraft. The high-pressure inducer is also very bulky.
Another common disadvantage of the Cat 40 cooling inducer is the pressure drop that results from it. The Cat 40 cooling inducer creates a pressure drop when it is used. This is because the flow is not completely uniform. This means that a pressure drop is created along the flow, which requires additional cooling fans to ensure that the pressure does not become too high.
A further disadvantage of the Cat 40 cooling inducer is the number of tubes that are needed to cool the flow. Each tube must be about three to four times as long as the tube it is serving. This can lead to very long tubes, which makes the inducer difficult to manufacture and install.
In the application of using a Cat 40 cooling inducer to cool fan inlet cases, there is a small potential for the engine to ingest some r when the inducer is mounted. This occurs because the inducer is connected to the engine case in such a way that the fan case flows through the inducer. This will cause some r to be drawn into the inducer, which will be forced out through the engine case. This can be prevented by installing a bypass valve at the induction side of the inducer. This allows the flow of liquid to be controlled, and will also prevent