MHT1055-2013 English PDF

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MHT1055-2013: Air spray equipment nozzle performance test methods
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
MH/T 1055-2013	279	Add to Cart	3 days	Air spray equipment nozzle performance test methods	Valid

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Basic data

Standard ID: MH/T 1055-2013 (MH/T1055-2013)
Description (Translated English): Air spray equipment nozzle performance test methods
Sector / Industry: Civil Aviation Industry Standard (Recommended)
Word Count Estimation: 11,127
Date of Issue: 30/9/2013
Date of Implementation: 1/12/2013
Issuing agency(ies): Civil Aviation Administration of China

MHT1055-2013: Air spray equipment nozzle performance test methods

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
The test methods for nozzle performance of aerial spraying equipment ICS 03.220.50 Civil Aviation Industry Standard of the People's Republic of China Aeronautical spray equipment nozzle performance test method 2013-09-30 released 2013-12-01 implementation Issued by Civil Aviation Administration of China

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by the Transportation Department of the Civil Aviation Administration of China. This standard was approved by the Aircraft Airworthiness Certification Department of the Civil Aviation Administration of China. This standard is under the jurisdiction of the China Academy of Civil Aviation Science and Technology. Drafting organization of this standard. The Second Research Institute of Civil Aviation Administration of China. The main drafters of this standard. Zhu Xiaobo, Jin Junhao, Wang Bingxi, Li Xin, Wang Peng, Yu Jin, Zhu Chuanyin. Test method for nozzle performance of aviation spray equipment

1 Scope

This standard specifies the test method for the performance of the hydraulic nozzle of aviation spray equipment. This standard applies to the evaluation of hydraulic nozzles of airborne spray equipment for agriculture, forestry, sanitation and scientific experiments.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T.20183.1 Plant protection machinery spray equipment Part 1.Test method for sprayer nozzle

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Hydraulic energy nozzle A part or assembly with a small hole through which a liquid passes under a certain pressure to form a mist stream. Note. This term can be referred to simply as “sprinkler” if it does not cause misunderstanding. 3.2 Flow rate The amount of liquid ejected by the nozzle per unit time. 3.3 Coverage density of droplets The number of droplets covered per unit area of the target. 3.4 Sampling line A line connected by multiple sampling points in the droplet collection area. 3.5 Spray angle The angle formed along the boundary of the mist flow near the nozzle.

4 General requirements

4.1 The test equipment and materials (see Appendix A) should be prepared before the test to ensure that its performance meets the test requirements, and the specifications and models Recorded in the list in Appendix A. 4.2 The test liquid should be prepared before the test, including clear water without suspended solids, an aqueous solution containing 20 g of alumina particles per liter (oxidized The purity of aluminum is about 99.5%, the median diameter (NMD) is 10 μm～45 μm) and the aqueous solution containing surfactants (the surface tension of the solution is 35 mN/m±5 mN/m). The name of the surfactant and the concentration of the mixture are recorded in the appendix B test report. 4.3 During the test, ensure that the temperature of the test solution and the laboratory temperature and humidity meet the test requirements, and the temperature of the test solution and the laboratory temperature are 10 ℃～ 25 ℃, the relative humidity of the laboratory is not less than 50%. The temperature and relative humidity values are recorded in the test report in Appendix B. 4.4 During the test, ensure that the change in spray pressure does not exceed ±2.5% of the set pressure value, and perform the test when the test pressure is stable. The set pressure value is recorded in the test report in Appendix B.

5 Measurement of nozzle performance

5.1 Measurement content The test content should include. a) Consistency of nozzle flow; b) Flow rate under different pressures; c) Distribution of spray volume; d) Wear resistance of nozzles; e) The droplet size; f) Fog drop coverage density; g) Spray angle. 5.2 Consistency of nozzle flow 5.2.1 Use clean water without suspended solids to test. 5.2.2 Under the same sampling conditions, randomly select 40 nozzles of the same model from a batch of at least.200 nozzles, and divide them into two groups. One group was used for spray test, and the other group was stored in the laboratory for comparison. 5.2.3 The volumetric method is used to measure the spray volume of each nozzle under the test pressure of 0.3 MPa, the measurement error should be less than 1%; the measurement time should not Less than 180 s, the measurement error should be less than 1 s; the number of measurements should be no less than 3 times, calculate the flow rate separately and use the average as the flow rate of the nozzle Quantity (in liters per minute (L/min)). 5.2.4 Record the flow rate of a single nozzle to be tested, calculate the average flow rate of 20 nozzles, and use the flow rate of a single nozzle to compare The average flow is expressed as a percentage. 5.3 Flow rate at different pressures 5.3.1 Use the nozzle with the flow rate closest to the average flow rate determined in 5.2 for the test. 5.3.2 The selected test solution is the same as 5.2.1. 5.3.3 The test should be carried out under the maximum and minimum pressure specified by the nozzle manufacturer and at least two pressure values between the two. The test pressure value Gradient distribution as much as possible. 5.3.4 Measure the flow rate of the sprinkler under each test pressure according to the method in 5.2.3 (unit is liters per minute (L/min)). 5.3.5 Record the flow of the nozzle under different pressures. 5.4 Distribution of spray volume 5.4.1 The spray volume distribution test bench is used to measure the spray volume distribution. For the components and size requirements of the test bench, see GB/T.20183.1. 5.4.2 The selected nozzle is the same as 5.3.1, the test solution is the same as 5.2.1, and the set test pressure value is the same as 5.3.3. 5.4.3 The sprinkler should be installed vertically above the test bench and ensure the integrity of the spray liquid collection by the mist collecting tank. If the nozzle manufacturer gives Test height, the test should be carried out at this height; otherwise, the test should be at least 400 mm, 600 mm, 800 mm and 1000 mm in height get on. The height should be the distance between the top of the test bench and the nozzle hole. 5.4.4 The spray liquid collection should be carried out when the spray head is working normally. When there is a measuring cylinder in the test bench, the collected spray liquid reaches 90% of the capacity of the measuring cylinder. When the test is stopped, the test should be stopped immediately, and the amount of spray liquid collected in each measuring cylinder (in milliliters (mL)) should be recorded. 5.4.5 Record the distribution of spray volume, the value of which is the percentage of the liquid volume collected by each mist collecting tank to the average liquid volume collected by all mist collecting tanks. fraction. 5.5 Wear resistance of nozzle 5.5.1 Select 5 nozzles for testing according to the method in 5.3.1. 5.5.2 Use an aqueous solution containing 20 g of alumina particles per liter for the test. It should be ensured that the temperature of the aqueous solution during the whole test is 20 ℃±3 ℃; technical means (such as agitating the solution by controlled compressed air flow) should be used to ensure that the abrasive is always evenly distributed In the entire test solution; in order to ensure that the test solution maintains the abrasive performance of the nozzle material during the entire test period, the abrasive fluid should be replaced in time. 5.5.3 The test pressure (pt) should be selected according to the maximum pressure (ps) recommended by the nozzle manufacturer according to the following rules. 5.5.4 Use a flow meter to measure the instantaneous flow rate of each of the 5 nozzles (unit. liters per minute) according to the wear time set below. (L/min)). When the flow rate has increased by at least 15% or the wear time reaches 100 h, the test should be stopped. 5.5.5 Measure and calculate the flow rate change rate of the nozzle (expressed as the percentage of the flow rate change relative to the initial flow rate), and plot the flow rate change The relationship curve between rate and wear time. 5.5.6 At the beginning and end of the test and when the nozzle flow rate exceeds 5%, 10% and 15% of its initial flow rate, measure the spray volume distribution (see 5.4). 5.6 Droplet size 5.6.1 The laser particle size analyzer is used to measure the droplet particle size. The configuration and performance of the instrument should meet the relevant requirements of the test. The schematic diagram of the instrument composition see picture 1. 5.6.2 The selected nozzle is the same as 5.3.1.The nozzle should be installed vertically above the laser beam in the test area, and the distance between the nozzle and the laser beam in the test area should be different. Less than 2 m (usually 2 m～3 m). 5.6.3 The selected test solution is the same as 5.2.1. 5.6.4 The test should be carried out at least under the following pressures. --The maximum and minimum pressure specified by the nozzle manufacturer; - The test pressure determined in accordance with 5.5.3. 5.6.5 Use a table or graph to indicate the droplet size distribution, and record the droplet size corresponding to 10%, 50% and 90% of the cumulative volume Numerical value. Figure 1 Schematic diagram of spray laser particle size analyzer 5.7 Fog drop coverage density 5.7.1 Use a suitable sampling device (such as magnesium oxide glass slides, water-sensitive paper, etc.) to collect fog drops, and measure the coverage density of fog drops; Set up a sampling device to ensure the integrity of the droplet collection, and the sampling interval should not be less than.200 mm. 5.7.2 The selected nozzles are the same as 5.3.1.The nozzle should be installed above the sampling line, and the long axis of the mist flow should be parallel to the sampling line. Nozzle and sampling line The vertical distance should not be less than 3 m. 5.7.3 Use an aqueous solution containing a surfactant (a soluble dye can be added if necessary) for the test. 5.7.4 The set test pressure is the same as 5.6.4. 5.7.5 During the test, make the nozzle pass above the sampling line once, and the moving speed of the nozzle should not exceed 3 m/s. Collect samples of collected droplets Device, and observe the number of droplets on the area of 1 cm2～3 cm2 of each sampling device. 5.7.6 Repeat the measurement three times, calculate the droplet coverage density of each measurement, and take the average value as the droplet coverage density of the nozzle. 5.8 Spray angle 5.8.1 The selected nozzles are the same as 5.3.1. 5.8.2 Use appropriate instruments (such as angle rulers, image acquisition devices), under 0.3 MPa and the maximum and minimum pressure specified by the manufacturer, Measure the spray angle of the nozzle (see Figure 2). Figure 2 Schematic diagram of spray angle measurement Laser receiving unit data processing system in test area of laser emitting unit Laser beam expander collimator lens Fourier lens photodetector Print head computer

6 Test report

Test related data and results should be recorded in the corresponding test report. For the format of the test report, see Appendix B. AA

Appendix A

(Informative appendix) List of test equipment and materials

Appendix B

(Informative appendix) Test report The test report format used in this standard is shown in Table B.1 ~ Table B.8.Among them, Table B.1 is the basic data, and Table B.2 ~ Table B.8 are the characteristics of the nozzle Can test conditions. ......

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