US-12625059-B2 - Snow accretion test method and snow accretion test device

US12625059B2US 12625059 B2US12625059 B2US 12625059B2US-12625059-B2

Abstract

In a snow accretion test method, a snow accumulation step of accumulating snow on a specimen, and a snow accretion step of freezing snow accumulated on the specimen in a state where snow is not supplied to the specimen are performed. The snow accumulation step and the snow accretion step are repeatedly performed. In the snow accretion step, the ambient temperature of the specimen is adjusted to a temperature lower than the ambient temperature in the snow accumulation step.

Inventors

Hiroyuki Enoki
Haruki SETO

Assignees

ESPEC CORP.

Dates

Publication Date: 20260512
Application Date: 20230925
Priority Date: 20220930

Claims (8)

1 . A snow accretion test method comprising: a snow accumulation step of accumulating snow on a specimen; and a snow accretion step of freezing snow accumulated on the specimen in a state where snow is not supplied to the specimen, the snow accretion step at least including a period in which an ambient temperature of the specimen is adjusted to a negative temperature, wherein in the snow accretion step, an ambient temperature of the specimen is adjusted to a temperature lower than an ambient temperature in the snow accumulation step.
2 . The snow accretion test method according to claim 1 , wherein the snow accumulation step and the snow accretion step are repeatedly performed.
3 . The snow accretion test method according to claim 1 comprising a snow drop step of raising an ambient temperature of the specimen or a specimen temperature so that snow accumulated on the specimen drops from the specimen.
4 . A snow accretion test method comprising: a snow accumulation step of accumulating snow on a specimen; a snow melting step of melting snow accumulated on the specimen in the snow accumulation step so that wet snow is accumulated on the specimen; and a snow accretion step of freezing the snow accumulated on the specimen in the snow accumulation step and melted in the snow melting step in a state where snow is not supplied to the specimen, the snow accretion step including a period in which an ambient temperature of the specimen is adjusted to a negative temperature.
5 . A snow accretion test device comprising: a test chamber configured for providing a snowfall environment; an air conditioner configured for air-conditioning an inside of the test chamber; a nozzle configured for spraying water particles for obtaining the snowfall environment in the test chamber; and a controller configured to control the air conditioner and the nozzle, wherein the controller is configured to perform a snow accumulation step of accumulating snow on a specimen by controlling the air conditioner and the nozzle so that a temperature in the test chamber becomes a temperature set as a temperature for the snow accumulation step and snow accumulates on the specimen, the controller is configured to perform a snow accretion step of freezing snow accumulated on the specimen after the snow accumulation step by controlling the air conditioner and the nozzle so that the temperature in the test chamber becomes a temperature set as a temperature for the snow accretion step and the snow accretion step includes a period in which an ambient temperature of the specimen is adjusted to a negative temperature so as to freeze the snow accumulated on the specimen in a state that snow is not supplied to the specimen, and in the snow accretion step, the controller controls the air conditioner so that an ambient temperature of the specimen is adjusted to a temperature lower than an ambient temperature in the snow accumulation step.
6 . The snow accretion test device according to claim 5 , wherein the controller is configured to control the air conditioner and the nozzle so that the snow accumulation step and the snow accretion step are repeatedly performed.
7 . The snow accretion test device according to claim 5 , wherein the controller is configured to control the air conditioner so that a snow drop step of raising an ambient temperature of the specimen or a specimen temperature is performed so that snow accumulated on the specimen drops from the specimen.
8 . A snow accretion test device comprising: a test chamber configured for providing a snowfall environment; an air conditioner configured for air-conditioning an inside of the test chamber; a nozzle configured for spraying water particles for obtaining the snowfall environment in the test chamber; and a controller configured to control the nozzle and the air conditioner, wherein the controller is configured to perform a snow accumulation step by controlling the air conditioner and the nozzle so that a temperature in the test chamber becomes a temperature set as a temperature for the snow accumulation step and snow accumulates on a specimen, the controller is configured to perform a snow melting step by controlling the air conditioner so that snow accumulated on the specimen in the snow accumulation step melts and wet snow is accumulated on the specimen, and the controller is configured to perform a snow accretion step by controlling the air conditioner and the nozzle so that the temperature in the test chamber becomes a temperature set as a temperature for the snow accretion step and the snow accretion step includes a period in which an ambient temperature of the specimen is adjusted to a negative temperature to freeze the snow accumulated on the specimen in the snow accumulation step and melted in the snow melting step in a state where snow is not supplied to the specimen.

Description

FIELD OF INVENTION The present invention relates to a snow accretion test method and a snow accretion test device. BACKGROUND ART Conventionally, a snow accretion test in which snow is caused to artificially fall and snow is caused to accumulate on a specimen is known. In conducting the snow accretion test, for example, a snow cannon disclosed in JP H5-113278 A can be used. That is, it is possible to forcibly cool the inside of a test chamber to −3° C. or lower, and to spray water in this state to cause snow to fall and accumulate on the specimen. However, only by simply causing snow to accumulate on the specimen, the resultant snow accumulation situation may be different from the snow accumulation situation obtained in a natural environment. That is, when snow accumulates on an object placed in a natural environment, snow may firmly adhere to the object. On the other hand, when snow is simply caused to fall in the test chamber, even if snow accumulates on the specimen, the snow can be easily scraped off. Therefore, it is difficult to say that the snow accretion situation occurring in the natural environment can be reproduced. SUMMARY OF THE INVENTION An object of the present invention is to make it possible to reproduce a snow accretion situation in a more natural environment. A snow accretion test method according to the present invention includes: a snow accumulation step of accumulating snow on a specimen; and a snow accretion step of freezing snow accumulated on the specimen in a state where snow is not supplied to the specimen, the snow accretion step at least including a period in which an ambient temperature of the specimen is adjusted to a negative temperature. A snow accretion test device according to the present invention is a snow accretion test device that is capable of carrying out the snow accretion test method, the snow accretion test device including: a test chamber for providing a snowfall environment; an air conditioner for air-conditioning an inside of the test chamber; a nozzle for spraying water particles for obtaining the snowfall environment in the test chamber; and a controller for controlling the air conditioner so that a temperature in the test chamber becomes a temperature set as a temperature for the snow accumulation step and a temperature for the snow accretion step, and activating the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view schematically illustrating a snow accretion test device for carrying out a snow accretion test method according to a first embodiment. FIG. 2 is a view for describing the snow accretion test method according to the first embodiment. FIG. 3 is a view for describing the presence or absence of snowfall and a change in a specimen ambient temperature in each step in the snow accretion test method. FIG. 4 is a view schematically illustrating a modification of the snow accretion test device for carrying out the snow accretion test method according to the first embodiment. FIG. 5 is a view for describing the snow accretion test method according to a second embodiment. FIG. 6 is a view schematically illustrating a modification of the snow accretion test device for carrying out the snow accretion test method according to the second embodiment. FIG. 7 is a view schematically illustrating a snow accretion test device for carrying out a snow accretion test method according to a third embodiment. FIG. 8 is a view for describing the snow accretion test method according to a fourth embodiment. FIG. 9 is a view for describing the presence or absence of snowfall and a change in the specimen ambient temperature in each step in the snow accretion test method. DETAILED DESCRIPTION Embodiments for carrying out the present invention will be described below in detail with reference to the drawings. First Embodiment FIG. 1 illustrates a snow accretion test device 10 that can carry out the snow accretion test method according to the present embodiment. The snow accretion test device 10 includes a test chamber 12 for providing a snowfall environment, an air conditioner 14 for air-conditioning the inside of the test chamber 12, a nozzle 18 arranged in the test chamber 12, and a controller 20 that controls the air conditioner 14 and the nozzle 18. The snowfall environment mentioned here is a temperature environment in which snow can be formed from water droplets, and means a temperature environment of −1° C. or lower, for example. The air conditioner 14 is configured to be able to adjust the air temperature in the test chamber 12 to a temperature suitable for the snowfall environment. The nozzle (spray nozzle) 18 is configured to spray fine water particles. For example, the nozzle 18 is configured by a two-fluid nozzle, and is configured to spray air and fine water particles (extremely fine water droplets). The nozzle 18 is connected with an air supply path 18a and a cold water supply path 18b. The nozzle 18 sprays compressed air (or cooled compressed air) supplied