Table of Contents
Page 1 - Contents
Page 2 - Introduction
Page 2 - Activity 1: Cessna-310 Performance Data
Page 3-4 - Activity 2: Propeller Parameter Definitions
Page 4 - Activity 3: Results of Engine RPM vs Fuel Flow
Page 5-6- Activity 4: Axial Momentum Theory
Page 7-8 - Activity 5: Propeller Efficiency & Power Coefficient
Page 8-9- Activity 6: Fuel Flow
Page 9 - Activity 7: Conclusion
Page 10- Reference
Introduction
The function of a propeller on an aircraft is to provide propulsive force. This lab report was aimed at studying and analysing the propeller and some engine properties of a Cessna 310R. The axial momentum theory, advance ratio and the energy method for fuel
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The pressure field changes across the disk and the free stream velocity is continuous through the propeller disk.
The following equation states that the propeller thrust is equal to the rate of change of axial momentum at the disk.
T=A(p2-p1)
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With reference to the above diagram, bernoulli equation can also be applied between sections 0-1 upstream and 2-3 downstream of the propeller.
Advance Ratio
The advance ratio is a measure of the advancement of the propeller in one revolution, measured in a number of diameters. The advance ratio is also a scaling parameter,
Indicating that all the propellers with the same J, and geometrically similar, have the same performance index. The table below shows aircraft speed range for a range of practical advance ratios.
Advance Ratio (J) = U / (rpm x d)
Where; J- Advance ratio
U- Speed
d- Diameter of the propeller
|J (ADVANCE RATIO) |U (m/s) when RPM |U (m/s) when RPM |U (m/s) when RPM |
| |equals 1000 |equals 1000 |equals 1000 |
|0.2 |6.43 |9.65 |12.87 |
|0.4 |12.87 |19.3 |25.73 |
|0.6 |19.3 |28.95 |38.6 |
|0.8 |25.74 |38.6
As a result of the experiment and computation of data, the aerofoil was found to have a critical Mach number of M=0.732. Below this freestream Mach number the Prandtl-Glauert law predicted results very
[2] Queen Mary University of London, DEN233, Low Speed Aerodynamics, Lecture Notes, 2013, (Accessed on 13th November 2013)
1) Use the Force Field Analysis or the Differentiation & Integration diagnostic model from Chapter 5 in the text to explain what is happening in this case. Include the appropriate chart/table.
The first ratio that will be used is the profit margin ratio. This ratio is computed by dividing net income by sales. The second ratio to be used is known as the return on assets ratio (ROA). Return on Assets is computed by dividing net income by total assets. The final ratio that will used within this report is called the return on equity ratio (ROE). This ratio can be calculated by dividing a company’s net income by its total equity.
1.) With all materials gathered, start by plugging the Power Supply Unit (PSU) into a free plug, making sure the PSU is switched to 6V.
Assuming no viscous forces present an inviscid model has been used for the calculations. Also from the equation of the Reynolds number Re=ρvl/μ due to Re being really big rearranging and assuming v and l to be constant the viscous force μ =ρvl/Re becomes negligible.
In this task i will be stating the different types of ratios and calculating them for the each type.
The second ratio represents the fraction of EBIT (i.e., operating profit) that the firm keeps after financing
Alternatively, it can also be explained by referring to the equation , where the k value is constant while the hydraulic gradient i defined by i = ΔH/L increases because the head difference ΔH is constant while the flow length L becomes shorter when it gets closer to the barrier wall.
Ever since the development of the first few examples of rocket power, it was evident that this was technology that was going to change the face of the world forever. Since missiles and other weaponry were now able to be launched across continents and even oceans, it made the world feel a whole lot smaller. In turn, this was the technology that “had its ultimate foundation in the simple power rocket which originated as a weapon of war” . However, this technology underwent an extreme transformation over time and was eventually the basis of the technology used to put spacecrafts up in space. One of the main rockets that is going to be discussed in this paper is the V2 rocket designed by the Germans during World War II, as much of the technology that put spacecrafts in space came from this rocket. Another aspect that is going to be
-The protractor of the aerofoil connected to the lift and drag voltmeters was then used to vary the aerofoil’s angle of attack from 0° to 20°. Lift and Drag voltage values measured for each angle were recorded and calibration coefficients of 6.7 and 6.4 were used to obtain force Newton values for lift and drag. The lift and drag forces obtained for each angle were then plugged into equations (3) and (4) to obtain lift and drag coefficients. Equation (5) was used to calculate a theoretical value for the lift coefficient.
That covers the basic function of an engine fron intake to exhaust. Next we will explore the relationship of Horsepower vs Torque.
1. What two parameters are responsible for creating the movement (filtration and reabsorption) of fluid across the capillary wall?
What would happen if you increased the driving pressure? Use the simulation to arrive at an answer. The concentration remained the same but the filtrate rate increased.
Ever since I was little I was amazed at the ability for a machine to fly. I have always wanted to explore ideas of flight and be able to actually fly. I think I may have found my childhood fantasy in the world of aeronautical engineering. The object of my paper is to give me more insight on my future career as an aeronautical engineer. This paper was also to give me ideas of the physics of flight and be to apply those physics of flight to compete in a high school competition.