Propfans are advanced aircraft engines related in concept to both the better-kno
ID: 3883289 • Letter: P
Question
Propfans are advanced aircraft engines related in concept to both the better-known turboprop and turbofan (jet engine). The design offers the speed and performance of a turbofan with the fuel economy of a turboprop. Most propfans have large numbers of short, highly twisted blades. Propfan development began in 1975, but was not seriously pursued due to excessive cabin noise as compared to turbofans and low fuel prices. With increasing prices for jet fuel and emphasis on engine/airframe efficiency to reduce emissions, there is renewed interest in propfans for jetliners. Current limitations include speed tip limits (optimum speed below 450 mph) due to drag and fuel economy. The best propfans currently achieve a 30% fuel economy improvement over turbofans, but with significantly more noise.
A test has recently been performed on a propfan-powered aircraft. In this test, the pilot set the engine power level at 40,000 N. The 20,000-kg aircraft attained a cruising speed of 175 m/s. The engine throttles were then set to a power level of 60,000 N, and the aircraft accelerated. As the speed of the plane increases, the aerodynamic drag increases in proportion to the square of the speed. After about 120 seconds, the aircraft reached a cruising speed such that the thrust from the engines was just offset by the drag. The equations used to estimate the velocity and acceleration of the aircraft from the time that the throttle was reset until the plane reached its cruising speed are as follows:
Write a C program that asks the user to enter the time elapsed (in seconds) since the power level was increased. Compute and print the corresponding acceleration and velocity of the aircraft at the new value of time.
Your program output will look like the illustration shown below. Use your PC’s cursor to determine the horizontal and vertical spacing for the output format.
/*******************************************************************************
AUTHOR SECTION
ENGR 200.xx DATE: mm/dd/yyyy
PROGRAM: # Author:
********************************************************************************
PROGRAM DESCRIPTION
This program will . The ___ will print to the screen (or whatever else it
does).
DESCRIPTION OF VARIABLES
NAME | TYPE | DESCRIPTION
-----------------------------------------------------------------------------
*******************************************************************************/
/* Preprocessor directives */
#include <stdio.h>
#include <math.h>
/* Main function */
int main(void)
{
/* Declare variables */
/* Print headings */
printf("********************************************");
printf(" ");
/* Input values */
/* Compute */
/* Print output values */
printf(" RESULTS");
printf(" ******************************************** ");
/* Exit the program */
return 0;
}
/******************************************************************************/
********************************************
PROPFAN VELOCITY AND ACCELERATION
Enter time value in seconds: x
RESULTS
Velocity = xxx.xxx m/s
Acceleration = xxx.xxx m/s^2
********************************************
OUTPUT FORMAT:
********************************************
PROPFAN VELOCITY AND ACCELERATION
Enter time value in seconds: x
RESULTS
Velocity = xxx.xxx m/s
Acceleration = xxx.xxx m/s^2
********************************************
velocity 0.00001 * time3-0.00477 * time2 + 0.78796 * time + 181.3566 acceleration = 3-0.000053 * velocityExplanation / Answer
Program :
/*******************************************************************************
AUTHOR SECTION
ENGR 200.xx DATE: mm/dd/yyyy
PROGRAM: # Author:
********************************************************************************
PROGRAM DESCRIPTION
This program will take elapsed time and . The Velocity and acceleration will print to the screen .
DESCRIPTION OF VARIABLES
NAME | TYPE | DESCRIPTION
-----------------------------------------------------------------------------
time double elapsed time(in sec)
velocity double velocity(in m/s)
acceleration double acceleration(in m/s^2)
*******************************************************************************/
/* Preprocessor directives */
#include <stdio.h>
#include <math.h>
/* Main function */
int main(void)
{
/* Declare variables */
double time,velocity,acceleration;
/* Print headings */
printf("********************************************");
printf(" ");
printf("PROPFAN VELOCITY AND ACCELERATION ");
/* Input values */
printf("Enter time value in seconds : ");
scanf("%lf",&time);
/* Compute */
velocity = 0.00001*pow(time,3) - 0.00477*pow(time,2) + 0.78796*time + 181.3566;
acceleration = 3 - 0.000053*pow(velocity,2);
/* Print output values */
printf(" RESULTS");
printf(" Velocity = %.3lf m/s",velocity);
printf(" Acceleration = %.3lf m/s^2",acceleration);
printf(" ******************************************** ");
/* Exit the program */
return 0;
}
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