Propeller Efficiency and the SolidWater™ Propeller
... Propeller efficiencies defined;! ! Fuel efficiency = smallest fuel quantity to reach hull speed or acceleration requirements (thrust).! ! Flow Efficiency = laminar discharge lowers turbulence, cavitation, boundary layer drag and thrust dispersion, all of which equate to improved efficiency ! ! Quiet ...
... Propeller efficiencies defined;! ! Fuel efficiency = smallest fuel quantity to reach hull speed or acceleration requirements (thrust).! ! Flow Efficiency = laminar discharge lowers turbulence, cavitation, boundary layer drag and thrust dispersion, all of which equate to improved efficiency ! ! Quiet ...
ASEN 3113 - Power Cycles
... • Conceptualized by Nikolaus August Otto (June 14, 1832 January 28, 1891) • Four stroke is more fuel efficient and clean burning than a two stroke cycle • Otto cycle consist of strokes: ...
... • Conceptualized by Nikolaus August Otto (June 14, 1832 January 28, 1891) • Four stroke is more fuel efficient and clean burning than a two stroke cycle • Otto cycle consist of strokes: ...
Turbomachinery
... blades or vanes (No closed volume). – Axial, centrifugal, mixed – Fluid increases momentum while moving through open passages and then converts high velocity to pressure rise in diffuser section • In radial machines doughnut-shaped diffuser is called a scroll ...
... blades or vanes (No closed volume). – Axial, centrifugal, mixed – Fluid increases momentum while moving through open passages and then converts high velocity to pressure rise in diffuser section • In radial machines doughnut-shaped diffuser is called a scroll ...
chapter 8
... use a magnetic field to accelerate and direct the ions through the nozzle. These types of systems are quite efficient and generate high exhaust speeds. In a gridded ion thruster, such as that used by NASA’s Dawn spacecraft, the ions are accelerated by passing them through grids of alternating charge ...
... use a magnetic field to accelerate and direct the ions through the nozzle. These types of systems are quite efficient and generate high exhaust speeds. In a gridded ion thruster, such as that used by NASA’s Dawn spacecraft, the ions are accelerated by passing them through grids of alternating charge ...
CUA Hovercraft
... lift fan and people working around the craft • Able to withstand a person falling against it • Provides sufficient barrier between fingers and ...
... lift fan and people working around the craft • Able to withstand a person falling against it • Provides sufficient barrier between fingers and ...
The condition given by Eq
... gradually. If the bucket width is too small in relation to the jet diameter, the fluid is not smoothly deflected by the buckets and, in consequence, much energy is dissipated in turbulence and the efficiency drops considerably. On the other hand, if the buckets are unduly large, the effect of fricti ...
... gradually. If the bucket width is too small in relation to the jet diameter, the fluid is not smoothly deflected by the buckets and, in consequence, much energy is dissipated in turbulence and the efficiency drops considerably. On the other hand, if the buckets are unduly large, the effect of fricti ...
Levitating Beachballs - Physics Department, Princeton University
... Discuss the vertical and horizontal stability of a beachball levitated by a vertical jet of air. This demonstration is familiar to denizens of science museums and hardware stores. As a complete solution is difficult, you may restrict your discussion to a simplified example. Consider a beachball of r ...
... Discuss the vertical and horizontal stability of a beachball levitated by a vertical jet of air. This demonstration is familiar to denizens of science museums and hardware stores. As a complete solution is difficult, you may restrict your discussion to a simplified example. Consider a beachball of r ...
Electrohydrodynamic atomization of fat milk.
... nozzle diameter with a relative standard deviation (RSD) of around 0,20. Some recent papers also describe the simple-‐jet mode with much higher flow rates (hundreds of mL/hr, Agostinho e. ...
... nozzle diameter with a relative standard deviation (RSD) of around 0,20. Some recent papers also describe the simple-‐jet mode with much higher flow rates (hundreds of mL/hr, Agostinho e. ...
ET 11-08-14 SET 2
... 7. A system contains 0.2 m3 of a gas at a pressure of 4 bar and 150°C. It is expanded adiabatically till the pressure falls to 1 bar. The gas is then heated at a constant pressure till its enthalpy increases by 100 kJ. Determine the total work done. Take Cp =1 kJ/kgK and Cv = 0.714 kJ/kgK. Or 8. 12 ...
... 7. A system contains 0.2 m3 of a gas at a pressure of 4 bar and 150°C. It is expanded adiabatically till the pressure falls to 1 bar. The gas is then heated at a constant pressure till its enthalpy increases by 100 kJ. Determine the total work done. Take Cp =1 kJ/kgK and Cv = 0.714 kJ/kgK. Or 8. 12 ...
The Scimitar Precooled Mach 5 Engine
... The Scimitar precooled Mach 5 cruise engine has been derived from the Reaction Engines SABRE engine designed to propel the SKYLON SSTO spaceplane. These engines are able to achieve high-speed air-breathing flight by using hydrogen fuel as a heat sink to lower the temperature of the decelerated inlet ...
... The Scimitar precooled Mach 5 cruise engine has been derived from the Reaction Engines SABRE engine designed to propel the SKYLON SSTO spaceplane. These engines are able to achieve high-speed air-breathing flight by using hydrogen fuel as a heat sink to lower the temperature of the decelerated inlet ...
ME19b. SOLUTIONS. Jan. 5, 2010. Due Jan. 14
... two departing jets are βb and (1 − β)b as indicated in the figure. It is assumed that the flow is planar and that the pressure in surrounding air is everywhere atmospheric. 1. Find the lift and drag on the wedge per unit length normal to the sketch as functions of ρ, U , b, β, α and θ. Note that dra ...
... two departing jets are βb and (1 − β)b as indicated in the figure. It is assumed that the flow is planar and that the pressure in surrounding air is everywhere atmospheric. 1. Find the lift and drag on the wedge per unit length normal to the sketch as functions of ρ, U , b, β, α and θ. Note that dra ...
Fluid System - Model paper 1
... Q 8. Explain cavitation in pumps. What is NPSH? Cavitation in pump When the liquid is flowing in the pump, it is possible that the pressure at any part of the pump may fall below the vapor pressure, then the liquid will vaporize and the flow will no longer remain continuous. The vaporization of th ...
... Q 8. Explain cavitation in pumps. What is NPSH? Cavitation in pump When the liquid is flowing in the pump, it is possible that the pressure at any part of the pump may fall below the vapor pressure, then the liquid will vaporize and the flow will no longer remain continuous. The vaporization of th ...
Internal Combustion Engine
... if acted on the piston will produce the work. Wnet = MEP x APiston x Stroke = MEP x Displacement vol. MEP ...
... if acted on the piston will produce the work. Wnet = MEP x APiston x Stroke = MEP x Displacement vol. MEP ...
Compressor Design - FAMU-FSU College of Engineering
... 2. The turning angle must be keep quite small, or the flow will also separate from the blade. 3. The relative approach velocity must not be too close to the speed of sound. This is to prevent shock waves from forming on the blade. Thus conventional propellers are used for flight speeds well below th ...
... 2. The turning angle must be keep quite small, or the flow will also separate from the blade. 3. The relative approach velocity must not be too close to the speed of sound. This is to prevent shock waves from forming on the blade. Thus conventional propellers are used for flight speeds well below th ...
Forces on an Airplane in Flight
... most family cars.) A mixture of fuel and air is compressed by the pistons, an electric spark causes the mixture to explode, driving the pistons downward. This motion is transferred to the crankshaft by connecting rods. The rotating crankshaft turns the propeller. ...
... most family cars.) A mixture of fuel and air is compressed by the pistons, an electric spark causes the mixture to explode, driving the pistons downward. This motion is transferred to the crankshaft by connecting rods. The rotating crankshaft turns the propeller. ...
Department of Mechanical Engineering
... 1] A jet of alcohol strikes the vertical plates shown in the figure. A force F=425 N is required to hold the plate stationary. Assuming there are no losses in the nozzle, estimate a) The mass flow rate of alcohol. b) The absolute pressure at section 1. 2] For the container shown, derive a formula fo ...
... 1] A jet of alcohol strikes the vertical plates shown in the figure. A force F=425 N is required to hold the plate stationary. Assuming there are no losses in the nozzle, estimate a) The mass flow rate of alcohol. b) The absolute pressure at section 1. 2] For the container shown, derive a formula fo ...
Fuel Combustion
... The dual combustion cycle (also known as the limited pressure or mixed cycle, Trinkler cycle, Seiliger cycle or Sabathe cycle) is a thermal cycle that is a combination of the Otto cycle and the Diesel cycle, first introduced by Russian-German engineer Gustav Trinkler. Heat is added partly at consta ...
... The dual combustion cycle (also known as the limited pressure or mixed cycle, Trinkler cycle, Seiliger cycle or Sabathe cycle) is a thermal cycle that is a combination of the Otto cycle and the Diesel cycle, first introduced by Russian-German engineer Gustav Trinkler. Heat is added partly at consta ...
Assignment - Gas Turbines and Engine Cycles
... Read carefully pages 1-30 of “Engines: An introduction”. This material is invaluable material for understanding engines. Some of the questions here and in quizzes will be from this reading. Problem 1. Write the expression for the Otto cycle efficiency (ideal) in terms of the compression ratio. Also ...
... Read carefully pages 1-30 of “Engines: An introduction”. This material is invaluable material for understanding engines. Some of the questions here and in quizzes will be from this reading. Problem 1. Write the expression for the Otto cycle efficiency (ideal) in terms of the compression ratio. Also ...
How Airplanes Fly
... Forces – The above mentioned concepts are all forces that help or oppose motion in the directions. Newton’s Laws Gravitation – The forces of gravity and weight play a big role in maintaining flight. Energy – Engines must use potential and kinetic energy to actually form motion. Heat is also ...
... Forces – The above mentioned concepts are all forces that help or oppose motion in the directions. Newton’s Laws Gravitation – The forces of gravity and weight play a big role in maintaining flight. Energy – Engines must use potential and kinetic energy to actually form motion. Heat is also ...
Worksheet-ImpulseAndMomentum
... 15. A rocket takes off from the surface of Earth straight up. The total mass of the rocket is 5000 kg, 3500 kg of which is fuel. The exhaust gas velocity is 3000 m/s, and the rocket consumes 25 kg of fuel per second. For how long do the engines burn? What is the thrust of the engine? What are the in ...
... 15. A rocket takes off from the surface of Earth straight up. The total mass of the rocket is 5000 kg, 3500 kg of which is fuel. The exhaust gas velocity is 3000 m/s, and the rocket consumes 25 kg of fuel per second. For how long do the engines burn? What is the thrust of the engine? What are the in ...
Introduction to Aerospace Engineering Formulas
... g = The gravitational constant. (Value at sea level is 9.81N/kg) (N/kg) h = The height above the earth surface. (m) V = The speed of the airplane relative to the air. (m/s) pt = The total pressure. (P a = N/m2 ) p0 = The static pressure. (P a = N/m2 ) S = The wing surface. (m2 ) L = The lift force. ...
... g = The gravitational constant. (Value at sea level is 9.81N/kg) (N/kg) h = The height above the earth surface. (m) V = The speed of the airplane relative to the air. (m/s) pt = The total pressure. (P a = N/m2 ) p0 = The static pressure. (P a = N/m2 ) S = The wing surface. (m2 ) L = The lift force. ...
Class_3_-_Subarea_VI
... • A reaction force developed when mass is expelled or accelerated in one direction, causing a proportional force in the opposite direction • In air transportation it occurs by pushing airflow over a wing, usually by spinning a propeller or a fan pulling air through a jet engine ...
... • A reaction force developed when mass is expelled or accelerated in one direction, causing a proportional force in the opposite direction • In air transportation it occurs by pushing airflow over a wing, usually by spinning a propeller or a fan pulling air through a jet engine ...
Jet engine
A jet engine is a reaction engine discharging a fast moving jet that generates thrust by jet propulsion in accordance with Newton's laws of motion. This broad definition of jet engines includes turbojets, turbofans, rockets, ramjets, and pulse jets. In general, jet engines are combustion engines but non-combusting forms also exist.In common parlance, the term jet engine loosely refers to an internal combustion airbreathing jet engine (a duct engine). These typically consist of an engine with a rotary (rotating) air compressor powered by a turbine (""Brayton cycle""), with the leftover power providing thrust via a propelling nozzle. Jet aircraft use these types of engines for long-distance travel. Early jet aircraft used turbojet engines which were relatively inefficient for subsonic flight. Modern subsonic jet aircraft usually use high-bypass turbofan engines. These engines offer high speed and greater fuel efficiency than piston and propeller aeroengines over long distances.