CN102565123B - Method for measuring air ratio and heat capacity ratio by adiabatic compression as well as modifying data - Google Patents
Method for measuring air ratio and heat capacity ratio by adiabatic compression as well as modifying data Download PDFInfo
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- CN102565123B CN102565123B CN201110423452.7A CN201110423452A CN102565123B CN 102565123 B CN102565123 B CN 102565123B CN 201110423452 A CN201110423452 A CN 201110423452A CN 102565123 B CN102565123 B CN 102565123B
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Abstract
The invention discloses a method for measuring air ratio and heat capacity ratio by adiabatic compression as well as modifying data and relates to the field of physical parameter measurement. For experiments of students, a plurality of data are required to be measured within 3-4 hours, so that the heat insulating effect of a container accommodating the air is poor, the heat insulating effect is poor and the pumping speed is extremely low; and the air ratio and the heat capacity ratio are generally measured by adopting an adiabatic expansion method and cannot be measured by adopting the adiabatic compression. Due to the influence from non-heat-insulating factors, measurement values of the air ratio and the heat capacity ratio are extremely small. The invention adopts the technical scheme that quick pumping is realized by reducing the volume of a gas container and high-speed sampling and data modification are subsequently carried out. The method for measuring the air ratio and the heat capacity ratio by the adiabatic compression, which is disclosed by the invention, is beneficial to the understand of the students and the guidance of the students understanding the influence on experimental data caused by heat radiation and a processing method thereof, so that the students can better understand air ratio and heat capacity ratio parameters, and a scientific data processing method is preliminarily established.
Description
Technical field
The present invention relates to the physical parameters measurement field, particularly the measurement of physical parameter air specific heat ratio.
Background technology
The measurement of physical parameter air specific heat ratio is a Classic Experiments of most of universities, the time restriction of student experimenting roughly 3-4 hour, measure a plurality of data, the insulation effect of the container of splendid attire air just can not be very good, otherwise time-consuming very, container generally adopts glass material, because insulation effect is not good and the speed of inflating is too slow, at the measurement air specific heat ratio, generally all adopt the method for adiabatic expansion to measure, the impact brought in order to reduce nonadiabatic factor, generally all adopt bigbore venting valve to shorten deflation time.Can not realize that adiabatic compression measures air specific heat ratio.
Due to the impact of nonadiabatic factor, cause the measured value of coefficient of air specific heat ratio less than normal.
Summary of the invention
Realize that adiabatic compression measures air specific heat ratio, subject matter is to shorten to inflate the time, and dwindling volume of a container is exactly a way.
The technical scheme that the present invention solves its technical matters employing is: get the happy 500 milliliters of water tumblers buckleing sealing of rigid plastic band, the hole of at bowl cover and the cup end, boring respectively a 4mm, a hole plays gas, and a hole connects air pressure measuring apparatus, notices that each device can not have gas leakage.
Obtain by experiment experimental data, table 1 is an example of experimental data.
The data correction reason: the pressure 10.8hPa of sensor measurement is the pressure reduction of room pressure relative standard air pressure, 0.21 second consuming time of the maximal value 95.3hPa that inflates (from 1.67 seconds to 1.88 seconds), during from maximal value 95.3hPa heat radiation 0.21 second (from 1.88 seconds to 2.09 seconds), pressure reduces 95.3-89.1=6.2hPa, have reason to believe in the 0.21 second time of inflating, also have heat radiation to cause the maximal value 95.3hPa measured less than actual maximal value.
Data correcting method: adopt the method matching of fitting of a polynomial to drop to 89.1hpa from the pressure caused because of heat radiation of 1.88 seconds to 2.09 seconds from 95.3hPa, obtain polynomial expression.The air pressure recruitment of supposing each sampling time interval is exactly the inflate quantity in this sampling time, calculate the pressure values that this inflate quantity is used polynomial computation to reduce from 1.88 seconds sampling times corresponding to maximum gas pressure 95.3hPa in sampling time, all reduction pressure values of sampling time after by polynomial computation of inflating are added up to total correction.
This experimental data result of calculation is: polynomial expression corresponding to quadratic power matching is y=84.5(1-0.5699t+1.195*t*t), wherein y is relatively indoor pressure difference, t is the time difference with respect to 1.88 seconds, 84.5 relatively indoor pressure difference while being 1.88 seconds, correction formula in time is 1-0.5699t+1.195*t*t; Modified value 84.5-80.86=3.64hpa.The calculated value of air specific heat ratio=(95.3-10.8+3.64)/(72.4-10.8)=1.42 are more approaching with theoretical value 1.402.
The invention has the beneficial effects as follows: be conducive to the student and understand the method for measuring air specific heat ratio by adiabatic compression, be conducive to guiding student and understand impact and the disposal route thereof of heat radiation on experimental data, make the student can understand better the air specific heat ratio parameter, tentatively set up the data processing method of science, be good at finding rule from data.
Table 1 experimental data
The pressure that table 2 process of inflating causes because of the heat radiation correction that diminishes
| ?t_sample(s) | P(hPa) | t_delta(s) | P_delta1(hPa) | P_delta2(hPa) |
| 1.67 | 10.8 | 0.21 | 0 | 0.00 |
| 1.68 | 12 | 0.2 | 1.2 | 1.12 |
| 1.69 | 14.9 | 0.19 | 2.9 | 2.71 |
| 1.7 | 18.6 | 0.18 | 3.7 | 3.46 |
| 1.71 | 22.7 | 0.17 | 4.1 | 3.84 |
| 1.72 | 27.1 | 0.16 | 4.4 | 4.13 |
| 1.73 | 31.9 | 0.15 | 4.8 | 4.52 |
| 1.74 | 36.7 | 0.14 | 4.8 | 4.53 |
| 1.75 | 41.9 | 0.13 | 5.2 | 4.92 |
| 1.76 | 47 | 0.12 | 5.1 | 4.84 |
| 1.77 | 52.2 | 0.11 | 5.2 | 4.95 |
| 1.78 | 57.5 | 0.1 | 5.3 | 5.06 |
| 1.79 | 62.9 | 0.09 | 5.4 | 5.18 |
| 1.8 | 68.1 | 0.08 | 5.2 | 5.00 |
| 1.81 | 73.1 | 0.07 | 5 | 4.83 |
| 1.82 | 77.9 | 0.06 | 4.8 | 4.66 |
| 1.83 | 82.5 | 0.05 | 4.6 | 4.48 |
| 1.84 | 86.5 | 0.04 | 4 | 3.92 |
| 1.85 | 90 | 0.03 | 3.5 | 3.44 |
| 1.86 | 92.8 | 0.02 | 2.8 | 2.77 |
| 1.87 | 94.7 | 0.01 | 1.9 | 1.89 |
| 1.88 | 95.3 | 0 | 0.6 | 0.60 |
| 84.5 | 80.86 |
Claims (1)
1. adiabatic compression is measured air specific heat ratio and data correcting method, relate to physical parameters measurement, the design of air inclusion container, inflate, measurement and data correction, it is characterized in that: (1), get the happy 500 milliliters of water tumblers that seal of buckle of rigid plastic band, the hole of at bowl cover and the cup end, boring respectively a 4mm, a hole plays inflator, and a hole connects air pressure measuring apparatus, notices that each device can not have gas leakage; (2), the pressure change after obtaining the pressure change of inflating and beaten gas with the sampling time interval speed of 0.01 second; (3), by the pressure change rule after having inflated, revise and inflate the minimizing of the pressure that the heat radiation of interlude internal cause causes.
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| CN201110423452.7A CN102565123B (en) | 2011-12-16 | 2011-12-16 | Method for measuring air ratio and heat capacity ratio by adiabatic compression as well as modifying data |
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| CN201110423452.7A CN102565123B (en) | 2011-12-16 | 2011-12-16 | Method for measuring air ratio and heat capacity ratio by adiabatic compression as well as modifying data |
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| CN102565123A CN102565123A (en) | 2012-07-11 |
| CN102565123B true CN102565123B (en) | 2014-01-08 |
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| CN102778543B (en) * | 2012-08-10 | 2014-12-31 | 南京千韵电子科技有限公司 | Device for measuring ratio of specific heat capacity of gas |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101718726A (en) * | 2009-11-30 | 2010-06-02 | 河海大学 | Device and method for measuring gas specific heat ratio |
| CN201518009U (en) * | 2009-11-06 | 2010-06-30 | 陕西科技大学 | Gas constant pressure specific heat determinator with bypass valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4258667B2 (en) * | 2005-09-30 | 2009-04-30 | 独立行政法人産業技術総合研究所 | Thermophysical property measuring method and apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201518009U (en) * | 2009-11-06 | 2010-06-30 | 陕西科技大学 | Gas constant pressure specific heat determinator with bypass valve |
| CN101718726A (en) * | 2009-11-30 | 2010-06-02 | 河海大学 | Device and method for measuring gas specific heat ratio |
Non-Patent Citations (5)
| Title |
|---|
| JP特开2007-93509A 2007.04.12 |
| 于永江.空气比热容比测定实验的系统误差分析及压强修正.《实验室研究与探索》.2005,第24卷(第12期), |
| 张焕德.空气比热容比γ测量值准确度的分析与研究.《大学物理实验》.2010,第23卷(第4期), |
| 空气比热容比γ测量值准确度的分析与研究;张焕德;《大学物理实验》;20100831;第23卷(第4期);第15-16页第1-2节 * |
| 空气比热容比测定实验的系统误差分析及压强修正;于永江;《实验室研究与探索》;20051231;第24卷(第12期);第26-27页第4-6节 * |
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