20-11-2012, 06:25 PM
Pistonless pump for rocket
[attachment=40459]
ABSTRACT:
Pistonless pump for rocket has been proved to be the most economical than piston pump or turbopump.
In pistonless pumps, piston is absent. It has very much less rotating parts than that of piston pumps or turbo pumps. So, it has less friction losses and there by it helps to improve the efficiency of the engine considerably.They can be easily installed in the rocket than turbopumps.Also,it reduces the weight of rocket.
This article discusses the working , advantages of pistonless pump over turbopump.
Pistonless pumps are 80-90% economical than that of piston pump or turbo pumps.Nasa has manufactured such kind of pump and tested it actually,and they found it works conveneiently.
INTRODUCTION:
NASA have developed a Low cost rocket fuel pump which has
Comparable performance to turbopump at 80-90% lower cost. Perhaps
the most difficult barrier to entry in the liquid rocket business is the
turbo pump. A turbo pump design requires a large engineering effort
and is expensive to mfg. and test. Starting a turbo pump fed rocket
engine is a complex process, requiring a careful of many valves and
subsystems.In fact ,Beal aerospace tried to avoid the issue entirely by
building a huge pressure feed booster. Their booster never flew, but the
engineering behind it was sound and ,if they had a low cost pump at
their disposal ,they might be competing against Boeing. This pump
saves up to 90% of the mass of the tanks as compared to a pressure
fed system. This pump has really proved to be a boon for rockets . By
this pump the rocket does not have to carry heavy load and can travel
with very high speed.
NECESSECITY:
The turbo pumps used in rocket are very heavy,containing many
rotating parts by which there are more frictional losses which
more consumption of fuel there by decreasing the efficiency of
the engine .Also, the maintainanace of such pump is, very
important factor since the rocket has to remain stable in the
space, is difficult and require complex methods for it. If this
pump gets any fault then its repairance requires long time and also
it is avery hectic task.So, there must be such a device which
overcomes all the drawbacks of the turbopump as above. The
pistonless pump is the solution for the problems faced by using
turbopumps. They have only a drawback that they supply fuel
with less pressure as compared to turbopumps.
THE DUAL PISTONLESS PUMP:
NASA has designed,built and tested a simple, light weight pump
(dual pistomless pump) for use in liquid propelled rocket where a
reliable pump with minimal moving parts is needed. This pump
has the potential to reduce the cost and increase the reliability of
rocket fuel pumps by a factor of 20 to 100.
WORKING:
Rocket engines requires a tremendous amount of fuel high
at high pressure .Often th pump costs more than the thrust
chamber.One way to supply fuel is to use the expensive
turbopump mentioned above,another way is to pressurize fuel
tank. Pressurizing a large fuel tank requires a heavy , expensive
tank. However suppose instead of pressurizing entire tank, the
main tank is drained into a small pump chamber which is then
pressurized. To achieve steady flow, the pump system consists of
two pump chambers such that each one supplies fuel for ½ of
each cycle. The pump is powered by pressurized gas which acts
directly on fluid. For each half of the pump system, a chamber is
filled from the main tank under low pressure and at a high flow
rate, then the chamber is pressurized, and then the fluid is
delivered to the engine at a moderate flow rate under high
pressure. The chamber is then vented and cycle repeats. The
system is designed so that the inlet flow rate is higher than the
outlet flow rate.This allows time for one chamber to be vented ,
refilled and pressurized while the other is being emptied.A bread
board pump has been tested and it works great .A high version
has been designed and built and is pumping at 20 gpm and 550psi.
[attachment=40459]
ABSTRACT:
Pistonless pump for rocket has been proved to be the most economical than piston pump or turbopump.
In pistonless pumps, piston is absent. It has very much less rotating parts than that of piston pumps or turbo pumps. So, it has less friction losses and there by it helps to improve the efficiency of the engine considerably.They can be easily installed in the rocket than turbopumps.Also,it reduces the weight of rocket.
This article discusses the working , advantages of pistonless pump over turbopump.
Pistonless pumps are 80-90% economical than that of piston pump or turbo pumps.Nasa has manufactured such kind of pump and tested it actually,and they found it works conveneiently.
INTRODUCTION:
NASA have developed a Low cost rocket fuel pump which has
Comparable performance to turbopump at 80-90% lower cost. Perhaps
the most difficult barrier to entry in the liquid rocket business is the
turbo pump. A turbo pump design requires a large engineering effort
and is expensive to mfg. and test. Starting a turbo pump fed rocket
engine is a complex process, requiring a careful of many valves and
subsystems.In fact ,Beal aerospace tried to avoid the issue entirely by
building a huge pressure feed booster. Their booster never flew, but the
engineering behind it was sound and ,if they had a low cost pump at
their disposal ,they might be competing against Boeing. This pump
saves up to 90% of the mass of the tanks as compared to a pressure
fed system. This pump has really proved to be a boon for rockets . By
this pump the rocket does not have to carry heavy load and can travel
with very high speed.
NECESSECITY:
The turbo pumps used in rocket are very heavy,containing many
rotating parts by which there are more frictional losses which
more consumption of fuel there by decreasing the efficiency of
the engine .Also, the maintainanace of such pump is, very
important factor since the rocket has to remain stable in the
space, is difficult and require complex methods for it. If this
pump gets any fault then its repairance requires long time and also
it is avery hectic task.So, there must be such a device which
overcomes all the drawbacks of the turbopump as above. The
pistonless pump is the solution for the problems faced by using
turbopumps. They have only a drawback that they supply fuel
with less pressure as compared to turbopumps.
THE DUAL PISTONLESS PUMP:
NASA has designed,built and tested a simple, light weight pump
(dual pistomless pump) for use in liquid propelled rocket where a
reliable pump with minimal moving parts is needed. This pump
has the potential to reduce the cost and increase the reliability of
rocket fuel pumps by a factor of 20 to 100.
WORKING:
Rocket engines requires a tremendous amount of fuel high
at high pressure .Often th pump costs more than the thrust
chamber.One way to supply fuel is to use the expensive
turbopump mentioned above,another way is to pressurize fuel
tank. Pressurizing a large fuel tank requires a heavy , expensive
tank. However suppose instead of pressurizing entire tank, the
main tank is drained into a small pump chamber which is then
pressurized. To achieve steady flow, the pump system consists of
two pump chambers such that each one supplies fuel for ½ of
each cycle. The pump is powered by pressurized gas which acts
directly on fluid. For each half of the pump system, a chamber is
filled from the main tank under low pressure and at a high flow
rate, then the chamber is pressurized, and then the fluid is
delivered to the engine at a moderate flow rate under high
pressure. The chamber is then vented and cycle repeats. The
system is designed so that the inlet flow rate is higher than the
outlet flow rate.This allows time for one chamber to be vented ,
refilled and pressurized while the other is being emptied.A bread
board pump has been tested and it works great .A high version
has been designed and built and is pumping at 20 gpm and 550psi.