Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Design a single stage rocket for Mars orbital insertion (liftoff from Mars). Required DeltaVee=3.5 km/sec using monopropellant hydrazine. The key to this problem is that higher chamber pressures lead to higher Isp, but they make the propellant tank heavier. Higher pressures also make the rocket engine easier to design. To make it easier for calculations, you should use Isp=250, pc=50 psi (or .35 Mpa) as a starting point. Determine mass ratio, chamber pressure and area ratio (Use above estimates at first, then check for consistency later), use tank mass for spherical composite or titanium tanks. (You can figure the tank mass or use a hydrazine tank from (https://www.psi-pci.com/) Assume structural mass 10% of tank mass. Engine mass=2% of thrust on Earth. (i.e. 100 lbf engine weight 2 lb) What is the exhaust pressure? (Answer: Mars Ambient=700 Pa, source https://mars.jpl.nasa.gov/MPF/science/atmospheric.html ) Determine chamber pressure to be significantly higher than exhaust ambient pressure on Mars, and pick an expansion ratio. Use these numbers to figure Isp from equation discussed in class. Some typical real numbers for pressure and Isp can be found at (https://cs.space.eads.net/sp/SpacecraftPropulsion/MonopropellantThrusters.html#ModelCHT400 Your number should be close (~20%)
For this case, assume that the pressure losses in the injector etc. are neglected. Determine required mass ratio given hydrazine Isp, make sure that the numbers add up. Neglect the weight of the pressurization system. Determine the max pressure that will still achieve orbit.
Evaluate the effect of the water spray on efficiency (net work out divided by heat input) and net power out per kg/s of dry air coming into the turbine.
determine the temperatures of surface 1 through 4 of the furnace cavity of example 13.3 if the entire furnace
consider a one-dimensional plane wall of thickness 2l. the surface at x -l is subjected to convective conditions
water in a pistoncylinder arrangement b is connected to a 1 m3 tank a by a line and valve. initially at state 1 the
the disk is horizontal and turns so that d thetadt ct about the vertical. forces cause a marble to move in a slot
a container has a circular hole d5cm on the bottom and is sealed by a metal ball weighs w2.452 with radius 4cm. water
a medical warmer operates using a heat pump. saturated r-12 enters the compressor at a temperature of -10 c and exits
what are the two possible arrangements for a concentric tube heat exchanger? for each arrangement what restrictions are
a ten-station rotary indexing machine performs nine machining operations at nine workstations and the tenth station is
a stream of refrigerant-134a at 1 mpa and 12 c is mixed with another stream at 1 mpa and 60 c. if the mass flow rate of
a turning operation calls for a single pass on a 3 diameter part down to 2.800 on a lathe using a hss high speed steel
a 25 cm long glass fiber e 72.2 gpa v 0.25 has a fracture strength of 75 mpa. what is the minimum diameter of a fiber
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd